多恩布什版宏观经济学英文练习题

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Exercise 多恩布什《宏观经济学》配套版讲义

Exercise 多恩布什《宏观经济学》配套版讲义

8) Which of the following would be most likely to cause a change in the natural rate of unemployment?
A) changes in monetary policy B) changes in the price of oil C) changes in the percentage of labor
E) An increase in taxes causes a reduction in demand for goods.
4) An increase in the reserve deposit ratio, q, will most likely have which of the following effects?
D) will cause investment to increase.
E) will have no effect on output or the interest rate.
14) For this question, assume that the saving rate decreases. We know that this reduction in the saving rate will cause which of the following?
B) The IS curve represents the single level of output where financial markets are in eg rate increased in period t.
E) none of the above
11) Use the following information answer the questions below

Chapter_15 The Demand for Money(宏观经济学,多恩布什,第十版)

Chapter_15 The Demand for Money(宏观经济学,多恩布什,第十版)


The more money a person holds, the less likely he or she is to incur the costs of illiquidity

The more money a person holds, the more interest he/she will give up → similar tradeoff encountered with transactions demand for money
4.

Standard of deferred payment
Money units are used in long term transactions (ex. loans)
15-5
The Demand for Money: Theory

The demand for money is the demand for real money balances → people hold money for its purchasing power

As liquidity of an asset decreases, the interest yield increases

A typical economic tradeoff: in order to get more liquidity, asset holders have to sacrifice yield


At the end of 2005, M1 = $4,596 per person Debate whether broader measure, M2, might better meet the definition of money in a modern payment system

多恩布什版宏观经济学英文练习题

多恩布什版宏观经济学英文练习题

多恩布什版宏观经济学英⽂练习题Chapter 22. Assume a German tourist buys a Mexican beer in a pub in Houston, Texas. How will the U.S. GDP be affected? CA.U.S. GDP will be unaffected, since a foreigner buys a foreign product.B. U.S. GDP will decrease since the beer has to be imported from MexicoC. U.S. GDP will increase by the value added at the Houston pubD. U.S. GDP will increase, but only by the sales tax assessed on the beer7. If nominal GDP is $10,406 billion and the GDP-deflator is 110, then real GDP is about $9,460 billion8. The GDP-deflator and the CPI differ from each other since CA. the GDP-deflator does not include services but the CPI doesB. the GDP-deflator includes imported goods but the CPI doesn'tC. the CPI measures a fixed market basket but the GDP-deflator doesn'tD. the CPI includes more goods than the GDP-deflator does9. Assume you desire a real rate of return of 4% on an investment and you expect the annual average inflation rate to be3.2%. What should the nominal interest rate be on this investment? 7.2%Chapter 93. Assume a model with no government and no foreign sector. If the consumption function is defined as C = 800 + (0.8)Y, and the income level is Y = 2,000, then the level of total saving is -4004. Assume a model with no government and no foreign sector. If we have a savings function that is defined as S = - 200 + (0.1)Y and autonomous investment decreases by 50, by how much will consumption change? -4505. Assume a model without income taxation and no foreign sector. If government purchases are increased by $25 billion financed by a lump sum tax increase of $25 billion, then AA. national income will increase by $25 billion but the budget deficit is unaffectedB. national income will increase $50 billion but the budget deficit is unaffectedC. neither national income nor the budget deficit will be affectedD. we cannot say for sure what will happen to national income or the budget deficit6. The size of the expenditure multiplier increases with an increase in CA. government transfer paymentsB. the marginal propensity to saveC. marginal propensity to consumeD. the income tax rate7. Assume the savings function is S = - 200 + (1/4)YD and the marginal tax rate is t = 20%. If the level of government spending increases by 100, by how much will the level of equilibrium income change? 2508. Assume a model of the expenditure sector with income taxes. If the level of autonomous investment decreases (due to negative business expectations), which of the following will be true? DA. the actual budget surplus will not be affectedB. the actual budget surplus will increaseC. the structural budget surplus will decreaseD. the cyclical component of the budget surplus will decrease9. Assume the consumption function is C = 600 + (3/4)YD and the income tax rate is t = 20%. What will be the effect on the actual budget surplus of an increase in autonomous investment by 200? an increase by 10010. Assume the consumption function is C = 200 + (0.8)YD and the income tax rate is t = 0.25. What will be the eff ect of an increase in government transfers by ΔTR = 100 on the full-employment budget surplus? an decrease by 100Chapter 104.哪些政策会使IS曲线变陡峭并向左移动?DA.货币供应量的减少B.政府转移⽀付的减少C.⼀笔税收的减少D.所得税率的减少5.LM曲线左上⽅表⽰DA.商品和服务的过度需求B.商品和服务的过度供给C.货币的过度需求D.货币的过度供给6.LM曲线会在什么情况下变平坦?BA.货币需求对利率变化的敏感度低B.货币需求对收⼊变化敏感度低C.货币需求对收⼊变化敏感度⾼D.货币政策乘数变⼤7.在IS-LM模型中,如果⾃主储蓄增加会导致收⼊和利率均减少8. 在IS-LM框架下,扩张性货币政策会增加消费和投资9.沿着AD曲线从左向右运动相当于BA.由于利率下降,IS右移B.由于实际货币余额增加,LM右移C.由于增加名义货币供给量,LM右移D.由于较低的实际货币余额,沿着LM曲线从左向右移动10.什么情况下AD曲线右移 AA.政府转移⽀付增加B.由于价格⽔平下降,实际货币余额增加C.⾃主储蓄增加D.央⾏限制名义货币供给量Chapter 111. 在美国,扩张性货币政策常以下⽅式进⾏:C A.财政部发⾏新债券来融资增加预算⾚字B. 美联储要求银⾏增加贷款活动C. 美联储从银⾏或政府安全经销商那购买债券,以换取⾦钱D.美联储乡政府出售债券4.扩张性财政政策的副作⽤利率上升会导致国内⽣产总值的组成发⽣变化5.如果央⾏固定汇率BA.每次财政扩张后要承担公开市场销售B.每次IS曲线变动时,央⾏都要调整货币供给C.财政政策变化不会影响消费和投资D.上述所有6.挤出指的是CA.当所得税提⾼时,消费⽔平降低B.投资补贴减少后,投资⽔平降低C.财政政策的变化通过改变利率影响GDP的构成D.流动性陷阱时,财政政策完全⽆效8. 如果政府通过投资补贴刺激经济,BA. 投资和产出⽔平会增加,但消费将不受影响B. 投资增长的⼀部分会通过提⾼利率来抵消C. 可避免增加利率D. 央⾏的帮助下仍然必要的,因为补贴不会使利率上升10. 如果央⾏拒绝⼤量增加政府⽀出,最可能的结果将是A.由于利率改变,国际收⽀的经常账户出现盈余B.由于利率改变,消费⽔平下降C.GDP组成发⽣变化D.上述所有Chapter 122. Which of the following items is a surplus item in the balance of payments for the United Sates?A. a U.S. car dealer buys 20 BMWs from Germany and sells them at a profit in the U.S.B. a U.S. citizen deposits funds in a bank in the BahamasC. a German firm pays to get a license for the use of American technologyD. Bill Gates buys himself a small island off the coast of Indonesia4. 如果美国商品的价格⽔平为P = 110,外国商品的价格⽔平为P f = 220,名义汇率为e=1.2,真正汇率为 2.46. The concept of relative purchasing power parity implies thatA. the real exchange rate adjusts slowly to its long-run average levelB. the domestic price level will change rapidly until the real exchange rate is equal to 1C. the relative demand for domestic goods will rise if the real exchange rate is below 1D. the long-run relative price level of domestic to foreign goods (P/P f) is equal to 17. Restrictive monetary policy in the U.S.A. lowers the value of the U.S. dollar relative to other currenciesB. increases the value of the U.S. dollar relative to other currenciesC. increases U.S. net exportsD. should not have any effect on the U.S. trade balance9. In a model with flexible exchange rates and perfect capital mobility, restrictive fiscal policy is likely to causeA. an appreciation of the domestic currencyB. a decrease in the current account surplusC. an increase in net exportsD. an inflow of funds10. A country that follows a beggar-thy-neighbor policyA. induces an exchange rate depreciation to increase domestic output via monetary policyB. uses fiscal policy to increase its competitiveness on world marketsC. imposes a tariff on imported goodsD. tries to benefit from an increase in world demand by selling domestic products at higher pricesChapter 52.The Keynesian AS-curve implies thatA) the economy is always at the full-employment level of outputB) the AS-curve is completely verticalC) wages and prices are completely flexibleD) a change in spending will affect the level of GDP but not the price level3 In the Keynesian AS-curve case, if the government cuts welfare payments, thenA) the price level will decrease, but the economy will remain at the full-employment level of outputB) the level of output will decrease but the price level will remain the sameC) the levels of output and prices will decreaseD) unemployment will increase, since wages and prices are completely flexible4.The slope of the AS-curve becomes steeperA) as wages and prices become more flexibleB) as wages become more rigidC) as the economy moves further away from full employmentD) as the government implements expansionary fiscal policy5.If the unemployment rate is assumed to be at its natural rate, thenA) inflation cannot existB) the unemployment rate is zeroC) the unemployment rate is positive but at a level that exists when GDP is at its potential levelD) all unemployment is cyclical in nature6.In the medium run, an increase in oil prices willA) increase the price level but reduce the level of outputB) lead to a decrease in aggregate demandC) lead to an increase in aggregate demandD) not affect the level of real output10.As potential GDP grows over timeA) the level of output is essentially determined by shifts in the vertical AS-curveB) the price level remains constantC) the AD-curve shifts to the right due to a change in the average price levelD) the level of actual output can only change if the AD-curve shifts accordinglyChapter 65.The coordination approach to the Phillips curve focuses on the fact thatA) fiscal and monetary policies often are uncoordinatedB) firms are reluctant to change wages and prices because they aren't sure what their competitors will doC) workers are well informed about changes in their nominal wages but not about changes in their real wagesD) anticipated changes in monetary policy have no significant effect on the unemployment rate7.Which of the following equations best describes Okun's law?A) (Y - Y*) = 0.5(u - u*)B) (Y - Y*)/ Y* = - 2(u - u*)C) (Y* - Y) = 2(u - u*)D) (Y* - Y)/Y = - 0.5(u - u*)9.Which of the following is the most likely result of an unanticipated increase in money supply?A) higher prices and output in the medium run but no change in output in the long runB) higher prices and lower real money balances in both the medium and the long runC) higher prices and employment in the medium run, but no change in output and prices in the long runD) higher prices and output in the medium and long runs10.If the government employs restrictive monetary policy in response to an adverse supply shock,A) the inflation rate and the natural rate of unemployment will both decreaseB) the rate of unemployment will increase sharplyC) unemployment will remain at its natural levelD) the shift in the AS-curve can be reversed almost immediatelyChapter 33.If we assume a Cobb-Douglas production function where the share of labor is 3/4 and the share of capital is 1/4, then the marginal product of capital can be calculated asA) 3Y/4KB) Y/4KC) 4Y/KD) Y/K5.Assume a Cobb-Douglas aggregate production function in which labor's share of income is 0.7 and capital's share of income is 0.3. At what rate will real output grow if labor grows at2.0%, the capital stock grows at 1.0%, and total factor productivity increases by 1.8%?A) 4.8%B) 3.5%C) 3.0%D) 1.8%6.In the neoclassical growth model, a decrease in the savings rateA) raises the growth rate of output per capitaB) lowers the growth rate of output per capitaC) raises the steady-state capital-labor ratioD) lowers the steady-state capital-labor ratio7.In the neoclassical growth model, a decrease in the rate of population growth willA) decrease the growth rate of outputB) decrease the level of output per capitaC) decrease the steady-state capital-labor ratioD) all of the above8.In the neoclassical growth model, a one-time increase in technology willA) increase the growth rate of outputB) shift the investment requirement line upC) increase the steady-state capital-labor ratioD) all of the aboveChapter 41.Constant returns to scale for capital alone implies thatA) as both capital inputs and labor inputs are doubled, output will more than doubleB) as both capital inputs and labor inputs are doubled, output will less than doubleC) as both capital inputs and labor inputs are doubled, output will doubleD) as capital inputs are doubled, output will less than double2.Paul Romer's notion of social returns to capital implies thatA) the contribution of any new knowledge will not just go to the producer of new knowledge but be shared by others as wellB) new capital investments have a bigger impact on growth if the owners of capital share their newfound wealth with the poorC) investment in real capital benefits society as a whole while investment in human capital only benefits those who invest in themselvesD) investment in real capital has a bigger impact on labor productivity than investment in human capital3.The distinction between private and social returns to capital is important sinceA) policy makers want to know how much the government can gain from capital investmentsB) capital investments cannot be undertaken profitably unless subsidized by the governmentC) capital investments often have important spillover effectsD) capital investment increases labor productivity4.Assume an endogenous growth model with labor augmenting technology and a production function of the form Y =F(K,AN), with A = 2(K/N) such that y = 2k. If the rate of population growth is n = 0.03, the rate of depreciation is d = 0.04, and the savings rate is s = 0.08, the growth rate of output per capita isA) 15%B) 9%C) 7%D) 1%5.Assume an endogenous growth model with labor augmenting technology and a production function of the form Y =F(K,AN), with A = 1.2(K/N) such that y = 1.2k. If the rate of population growth is n = 0.03, the rate of depreciation is d = 0.05, how large would the savings rate (s) have to be to achieve a per-capita growth rate of output of 4 percent?A) 12%B) 10%C) 8%D) 4%6.Assume an aggregate production function with a constant marginal product of capital and with capital as the only factor of production, such that Y = aK. If there is neither population growth nor depreciation of capital, the growth rate of per-capita output isA) Δy/y = saB) Δy/y = sa + (n - d)C) Δy/y = sa + (n + d)D) Δy/y = sa/(n + d)7.The idea that increased investment in research and development will enhance economic growth isA) the key to linking higher savings rates to higher equilibrium growth ratesB) totally unprovenC) a crucial element of conditional convergenceD) an important part of the neoclassical growth model8.Conditional convergence is predicted for two countries with the same population growth and access to the same technology. This means that they will eventuallyA) reach the same income per capita and the same economic growth rate even if they have different savings ratesB) reach a different income per capita but the same economic growth rate even if they have different savings ratesC) reach the same income per capita and different economic growth rates if they have different savings ratesD) reach different income per capita levels and different economic growth rates if they have different savings rates9.Endogenous growth theory predicts that countries will achieve higher economic growth rates if they manage toA) lower their population growthB) increase their savings ratesC) shield their industries from foreign competitionD) all of the above10.The four "Asian Tigers" achieved their economic growth between 1966 and 1990 mostly throughA) population controlB) protection of domestic industries from foreign competitionC) hard work and sacrificeD) a large degree of government interventionChapter 131.Keynes' theory of consumption behavior largely relied on the equation C = Co + cY. This equation implies that the value of the average propensity to consumeA) increases as the economy goes into a recessionB) increases as the economy goes into a boomC) remains constant whether the economy goes into a boom or a recessionD) is always lower than the value of the marginal propensity to consume2.Assume a worker at age 30 with no wealth and an expected average annual earnings of $50,000, who wants to retire at age 65 and expects to live until age 80. According to the life-cycle hypothesis what dollar amount does that person consume annually?A) $45,000B) $40,000C) $35,000D) $30,0003.If we divide consumption expenditures into the purchases of non-durable goods and the purchases of durable goods, we realize thatA) the life-cycle and permanent-income theories apply much more to the consumption of non-durable goods than durable goodsB) the consumption of non-durable goods is much more interest sensitive than the consumption of durable goodsC) the consumption of non-durable goods is more strongly affected by a surprise change in income than the consumption of durable goodsD) the consumption of durable goods this year is largely the same as the consumption of durable goods last year4.According to the permanent-income theory of consumptionA) the short-run multiplier is identical to the long-run multiplierB) the short-run multiplier is larger than the long-run multiplierC) the short-run mpc is larger than the long-run mpcD) the short-run mpc is smaller than the long-run mpc5.According to the permanent-income hypothesisA) increases in current income lead to large increases in current consumptionB) current consumption is not significantly affected by a temporary change in incomeC) the mpc out of transitory income is greater than the mpc out of permanent incomeD) increases in the interest rate will affect consumption negatively6.The random-walk theory of consumptionA) clearly contradicts the permanent-income theoryB) predicts that current consumption is most strongly affected by current incomeC) predicts that this year's consumption is most strongly affected by last year's consumptionD) does not support the notion that people have rational expectations7.The fact that consumption exhibits "excess smoothness" implies thatA) consumption responds too strongly to surprise changes in incomeB) current consumption can be predicted based on changes in current incomeC) changes in transitory income have no effect on current consumption or savingD) none of the above8.If we account for liquidity constraints,A) we can explain why a temporary tax increase may have an effect on current consumptionB) we have to discard the permanent-income hypothesisC) consumption becomes much more interest sensitiveD) consumption responds much less severely to surprise changes in income9.Household savings behavior tends to be fairly interest inelastic, which can be largely explained byA) a very large substitution effectB) the fact that the income effect dominates the substitution effectC) the fact that the substitution effect is largely offset by the income effectD) the fact that the consumption of durable goods tends to be very interest inelastic10.Which of the following is an objection to the Barro-Ricardo proposition?A) people believe that debt-financing merely postpones taxationB) people who benefit from a tax cut now are often not the same people who pay higher taxes laterC) a tax cut may ease a person's liquidity constraints, inducing the person to consume moreD) most people can borrow funds when necessary and therefore always consume according to their permanent income Chapter 141Which of the following will NOT affect the productive capacity of a country?A) more people getting a higher educationB) more people investing in government bondsC) the government improving the infrastructure such as bridges and highwaysD) firms replacing old PCs with newer, more efficient ones2In absence of taxation, the rental cost of capital can be defined asA) rc = i + πe - dB) rc = i - πe - dC) rc = i - πe + dD) rc = i + πe + d3If we ignore taxation and know that the rental cost of capital is 12%, the expected rate of inflation is 4%, and the nominal interest rate is 9%, we can conclude that the rate of depreciation must beA) d = 1%B) d = 7%C) d = 17%D) d = 25%4If the rental cost of capital is above the marginal product of capital, then a firm shouldA) increase its investment spendingB) decrease its investment spendingC) not replace some of the machines that have broken down in the production processD) undertake primarily replacement investments5Assume a Cobb-Douglas production function of the form Y = AK0.2N0.8. If the rental cost of capital is rc = 5%, the desired capital stock of a cost-minimizing firm should be equal toA) K* = 2YB) K* = 4YC) K* = 5YD) K* = 8Y6Assume the market interest rate is 10% and is not expected to change over the next three years. If an investment project has net returns of $2,420 after one year, $3,630 after the second year, and $3,993 after the third year, what is its net present discounted value?A) $10,043B) $9,130C) $9,020D) $8,2007The most likely source of funding for a U.S. firm wishing to finance a new investment project isA) a credit line with a bankB) retained earningsC) selling bondsD) issuing equity (stocks)8According to the accelerator model,A) a change in investment is proportional to the level of outputB) the level of investment spending is proportional to the level of outputC) the level of investment spending is proportional to the change in outputD) the level of investment spending is mainly affected by interest rate changes9Expansionary monetary policy has an effect on the housing market since itA) decreases the price of all assets, including housing pricesB) lowers real interest rates in the long run, so people will postpone buying homesC) lowers nominal interest rates, so banks find mortgage lending less profitableD) lowers nominal interest rates, so more homebuyers are able to qualify for mortgages10An unanticipated decrease in the level of inventories may occurA) in the midst of a boom, as firms prepare for the upcoming recessionB) in a boom when increased sales cannot be met by increases in productionC) in a recession when firms expect lower profits and try to keep their costs lowD) at the beginning of a recession as firms slash their prices to induce more salesChapter 151.As credit and debit cards are more widely used, we should expect thatA) more money balances will be held in M1B) more money balances will be held in M2C) less money balances will be held in M2D) less money balances will be held in M1, but those held in M2 will remain unchanged 2Which of the following would lead to increased money balances in M1?A) more purchases made on the internetB) more credit card purchasesC) lower inflationary expectationsD) all of the above3A financial asset is considered less liquid ifA) it has a longer maturityB) it is issued by the government rather than a large corporation such as MicrosoftC) it earns a lower yieldD) none of the above4The Baumol-Tobin square-root formula for money demand applies primarily toA) the transactions motive of holding moneyB) the precautionary motive of holding moneyC) the speculative motive of holding moneyD) the store-of-value motive of holding money5According to the Baumol-Tobin square-root formula, the amount of money balances held for transaction willA) increase as interest rates increaseB) decrease as the cost of money transactions increasesC) increase less than proportionately to increases in incomeD) all of the above6The speculative demand for moneyA) will always increase proportionately to the precautionary demand for moneyB) will always increase proportionately to the transactions demand for moneyC) is affected by changes in bond yields but not equity yieldsD) cannot be easily separated from money demand for transaction or precaution7If the expected growth rate in real GDP for next year is 2.5%, we can anticipate that the demand for M1 money holdings willA) also increase by 2.5%B) increase by more than 2.5%C) increase by less than 2.5%D) remain constant8The income velocity of money is defined asA) real money supply divided by real GDPB) nominal money supply divided by nominal GDPC) nominal GDP divided by nominal money supplyD) national income divided by the currency outstanding9If the government increases the level of government purchases, we can expect thatA) interest rates and the income velocity of money will both increaseB) interest rates and the income velocity of money will both decreaseC) interest rates will increase but the income velocity of money will decreaseD) interest rates will increase but the income velocity of money will remain the same 10According to the quantity theory of money, in the long runA) the behavior of velocity is hard to predictB) a change in money supply will be followed by a proportional change in the price levelC) an increase in nominal money supply will result in a proportional decrease in velocityD) an increase in nominal money supply will result in a proportional increase in velocity。

多恩布什《宏观经济学》第七版习题答案(英文)--02

多恩布什《宏观经济学》第七版习题答案(英文)--02

Solutions to Problems in the T extbook:Conceptual Problems:1. Government transfer payments (TR) do not arise out of any production activity and arethus not counted in the value of GDP. If the government hired the people who currently receive transfer payments, then their wages would be counted as part of government purchases (G), which is counted in GDP. Therefore GDP would rise.2.a. If the firm buys a car for an executive's use, the purchase counts as investment (I). But ifthe firm pays the executive a higher salary and she then buys a car, the purchase is counted as consumption (C).2.b. The services that a homemaker provides are not counted in GDP (regardless of theirvalue). However, if an individual officially hires his or her spouse to perform household duties at a certain wage rate, then the wages earned will be counted in GDP and GDP will increase.2.c. If you buy a German car, consumption (C) will increase but net exports (NX = X - Q) willdecrease. Overall GDP will increase by the value added at the foreign car dealership, since the import price is likely to be less than the sales price. If you buy an American car, consumption and thus GDP will increase. (Note: If the car you buy comes out of the car dealer's inventory, then the increase in C will be partially offset be a decline in I, and GDP will again only increase by the value added.)3. GDP is the market value of all final goods and services currently produced within thecountry. (The U.S. GDP includes the value of the Hondas produced by a Japanese-owned assembly plant that is located in the U.S., but it does not include the value of Nike shoes that are produced by an American-owned shoe factory located in Malaysia.) GNP is the market value of all final goods and services currently produced using assets owned by domestic residents. (Here the value of the Hondas produced by a Japanese-owned Honda plant is not counted but the value of the Nikes by the American-owned shoe plant is.)Neither is necessarily a better measure of the output of a nation. The actual value of the GDP and GNP for the U.S. is fairly close.4. The NDP (net domestic product) is defined as GDP minus depreciation. Depreciationmeasures the value of the capital that wears out during the production process and has to be replaced. Therefore NDP comes closer to measuring the net amount of goods produced in this country. If this is what you want to measure, then NDP should be used.5. Increases in real GDP do not necessarily mean increases in welfare. For example, if thepopulation of a country increases by more than real GDP, then the population of the country is on average worse off. Also some increases in output come from welfare reducing events. For example, increased pollution may cause more lung cancer, and the treatment of the lung cancer will contribute to GDP. Similarly, an increase in crime may lead to overtime work for police officers, whose increased salary will increase GDP. But the welfare of the people in the country may not have increased in either case. On the other hand, GDP does not always accurately measure quality improvements in goods or services (faster computers or improved health care) that improve people's welfare.6. The CPI (consumer price index) and the PPI (producer price index) are both measuredby looking at a certain market basket. The CPI's basket contains mostly finished goods and services that consumers tend to buy regularly in their daily lives. The PPI’s basket contains raw materials and semi-finished goods, that is, it measures costs to the producer of a product and its first user. The CPI is a concurrent economic indicator, whereas the PPI is a leading economic indicator.7. The GDP-deflator is a price index that covers the average price increase of all final goodsand services currently produced within an economy. It is defined as the ratio of current nominal GDP to current real GDP. Nominal GDP is measured in current dollars, while real GDP is measured in so-called base-year dollars. Even though early estimates of the GDP-deflator tend to be unreliable, the GDP-deflator can be a more useful price index than the CPI or PPI (both of which are fixed market baskets). This is true for two reasons: first it measures a much wider cross-section of goods and services; second, a fixed market basket cannot account for people substituting away from goods whose relative prices have changed, while the GDP-deflator, which includes all goods and services produced within the country, can.8. If nominal GDP has suddenly doubled, it is most likely due to an increase in the averageprice level. Therefore, the first thing you would want to check is by how much the GDP-deflator has changed, to calculate by how much real output (GDP) has changed. If nominal GDP and the GDP-deflator have both doubled, then real GDP should be the same.9. Assume the loan you made yields you an annual nominal return of 7%. If the rate ofinflation is 4%, then your rate of return in real terms is only 3%. If, on the other hand, if inflation rate is 10%, then you will actually get a negative real rate of return, that is, you will lose 3% of your purchasing power. One way to protect yourself against such a loss of purchasing power is to adjust the interest rate for inflation, that is, to index the loan. In other words, you can require that, in addition to the specified interest rate of the loan of,let’s say, 3%, the borrower also has to pay an inflation premium equal to the percentage change in the CPI. In this case, a real rate of return of 3% would be guaranteed.T echnical Problems:1. The text calculates the change in real GDP in 1992 prices in the following way:[RGDP01 - RGDP92]/RGDP92 = [3.50 - 1.50]/1.50 = 1.33 = 133%.To calculate the change in real GDP in 2001 prices, we first have to calculate the GDP of 1992 in 2001 prices. Thus we take the quantities consumed in 1992 and multiply them by the prices of 2001, as follows:Beer 1 at $2.00 = $2.00Skittles 1 at $0.75 = $0.75_______________________________Total$2.75The change in real GDP can now be calculated as[6.25 - 2.75]/2.75 = 1.27 = 127%.We can see that the growth rate of real GDP calculated this way is roughly the same as the growth rate calculated above.2.a. The relationship between private domestic saving, investment, the budget deficit and netexports is shown by the following identity:S - I ≡ (G + TR - TA) + NX.Therefore, if we assume that transfer payments (TR) remain constant, then an increase in taxes (TA) has to be offset either by an increase in government purchases (G), a decrease in net exports (NX), or a decrease in the difference between saving (S) and investment (I).2.b. From the equation YD ≡ C + S it follows that an increase in disposable income (YD) willbe reflected in an increase in consumption (C), saving (S), or both.2.c. From the equation YD ≡ C + S it follows that when either consumption (C) or saving (S)increases, disposable income (YD) must increase as well.3.a. Since depreciation D = I g - I n = 800 - 200 = 600 ==>NDP = GDP - D = 6,000 - 600 = 5,4003.b. From GDP = C + I + G + NX ==> NX = GDP - C - I - G ==>NX = 6,000 - 4,000 - 800 - 1,100 = 100.3.c. BS = TA - G - TR ==> (TA - TR) = BS + G ==> (TA - TR) = 30 + 1,100 = 1,1303.d. YD = Y - (TA - TR) = 5,400 - 1,130 = 4,2703.e. S = YD - C = 4,270 - 4,000 = 2704.a. S = YD - C = 5,100 - 3,800 = 1,3004.b. From S - I = (G + TR - TA) + NX ==> I = S - (G + TR - TA) - NX = 1,300 - 200 - (-100)= 1,200.4.c. From Y = C + I + G + NX ==> G = Y - C - I - NX ==>G = 6,000 - 3,800 - 1,200 - (-100) = 1,100.Also: YD = Y - TA + TR ==> T A - TR = Y - YD = 6,000 - 5,100 ==> TA - TR = 900From BS = T A - TR - G ==> G = (TA - TR) - BS = 900 - (-200) ==> G = 1,1005. According to Equation (2) in the text, the value of total output (in billions of dollars) canbe calculated as: Y = labor payments + capital payments + profits = $6 + $2 + $0 = $86.a. Since nominal GDP is defined as the market value of all final goods and servicescurrently produced in this country, we can only measure the value of the final product (bread), and therefore we get $2 million (since 1 million loaves are sold at $2 each).6.b. An alternative way of measuring total GDP would be to calculate all the value added ateach step of production. The total value of the ingredients used by the bakeries can be calculated as:1,200,000 pounds of flour ($1 per pound) = 1,200,000100,000 pounds of yeast ($1 per pound) = 100,000100,000 pounds of sugar ($1 per pound) = 100,000100,000 pounds of salt ($1 per pound) = 100,000__________________________________________________________ = 1,500,000Since $2,000,000 worth of bread is sold, the total value added at the bakeries is $500,000.7. If the CPI increases from 2.1 to 2.3, the rate of inflation can be calculated in thefollowing way:rate of inflation = (2.3 - 2.1)/2.1 = 0.095 = 9.5%The CPI often overstates inflation, since it is calculated by using a fixed market basket of goods and services. But the fixed weights in the CPI's market basket cannot capture the tendency of consumers to substitute away from goods whose relative prices have increased. Therefore, the CPI will overstate the increase in consumers' expenditures.8.The real interest rate (r) is defined as the nominal interest rate (i) minus the rate ofinflation (π). Therefore the nominal interest rate is the real interest rate plus the rate of inflation, ori = r + π = 3% + 4% = 7%.。

16宏观经济学英文版(多恩布什)课后习题答案全解

16宏观经济学英文版(多恩布什)课后习题答案全解

CHAPTER 16THE FED, MONEY, AND CREDITSolutions to the Problems in the Textbook:Conceptual Problems:1. The three tools the Fed has to conduct monetary policy are open market operations, discount ratechanges, and reserve requirement changes. If the Fed wants to increase the money supply, it has the following options: first, the Fed can buy government bonds from the public (mostly banks), thereby increasing bank reserves. These open market purchases will induce banks to extend their loans, which will create more money. Second, it can lower the discount rate, so it becomes less costly for banks to borrow reserves from the Fed. This also will induce banks to create more money by extending more loans. Finally, the Fed can lower the required-reserve ratio, which again will allow banks to lend more.2. The currency-deposit ratio is the ratio of currency outstanding to bank deposits. The Fed cannotdirectly influence this ratio, since it is determined by the behavior of the public and influenced by the convenience of obtaining cash and by seasonal patterns (increased Christmas shopping, for example).However, by changing either bank regulations (that would affect the ease of obtaining cash) or interest rates (that would change the opportunity cost of holding cash), the Fed may indirectly affect how much currency the public is willing to hold.3.a. 3.a.ii2i2i1 i10 0Y2 Y1 Y Y1 Y2 YIf most disturbances come from the money sector (a shift in money demand), interest rate targets work better than money targets. In the IS-LM diagram below we can see that as money demand increases due to changing expectations, the LM-curve will shift to the left and the interest rate will increase. By increasing money supply and shifting the LM-curve back to the right, the central bank can get the economy back to the original equilibrium.3.b. If most disturbances come from the expenditure sector, the central bank is better off targeting moneysupply. If spending increases, the IS-curve shifts to the right and the interest rate increases. If the central bank tried to get the interest rate back to its original level by increasing money supply, the disturbance would intensify, since the LM-curve would also shift to the right. Thus, the central bank should keep money supply (and thus the LM-curve) stable to keep the disturbance at a minimum.4.a. A bank run occurs when depositors, worried about the safety of their assets, rush to withdraw theirdeposits.4.b. If a bank is in trouble because it has made some bad investment decisions, people may expect it tofail. Thus they may want to withdraw their deposits before it is too late. Since other depositors are1likely to behave in the same way, a run on the bank can be anticipated. Even a fairly financially sound bank may not be able to withstand a run, since most assets are tied up in loans. Almost all U.S. banks are FDIC insured and therefore a run on a bank is very unlikely. With FDIC insurance, depositors know that they can get at least their principal back from the government should a bank fail, and therefore they do not panic easily.4.c. During the Great Depression, a large-scale run on banks lead to liquidity problems and bank failures.This decreased the lending power of the whole banking system. In other words, depositors lost their confidence in banks and withdraw their deposits. This increased the currency-deposit ratio, leading toa decrease in the money multiplier and a contraction in money supply.4.d. The existence of the FDIC increases the public's confidence in the banking system, so a run on banksis highly unlikely. Therefore the currency-deposit ratio is low and the value of the money multiplier is high. The money multiplier is also more stable since the public does not withdraw deposits any time a bank failure occurs.5.a. There are basically two reasons why the Fed does not adhere more closely to its monetary growthtargets in the short run. The first is technical: due to the variability of the money multiplier and the lag in collecting data on money supply figures, the Fed is not always able to achieve its monetary growth target. The second reason is that the Fed, in the short run, uses interest rate targets concurrently with monetary growth targets, and it is impossible to succeed at both at the same time. Therefore, as the Fed responds to changes in the economy, it may move away at least temporarily from its monetary growth target. The Fed's desire to have some short-run flexibility while still maintaining long-run credibility, may cause a temporary deviation from the announced monetary growth target.5.b. The targeting of nominal interest rates can be self-defeating, especially in times of high inflation. If(nominal) interest rates increase, the Fed has to increase money supply to reduce interest rates to their original level. However, expansionary monetary policy will lead to more inflation and this will ultimately result in higher nominal interest rates. The so-called Fisher-equation states that the nominal interest rate (i n) is equal to the real interest rate (i r) plus the rate of inflation (π), that is,i n = i r + π.In the long run, the real interest rate will not be affected by expansionary monetary policy, but the nominal interest rate will be higher due to increased inflation. Another attempt to further reduce the nominal interest rate by expanding money supply even more will aggravate inflation even more and ultimately not succeed in bringing interest rates down.6.a. Nominal GDP is an ultimate target of monetary policy.6.b. The discount rate is an instrument of monetary policy.6.c. The monetary base is an immediate target of monetary policy.6.d. M1 is an intermediate target of monetary policy.6.e. The Treasury bill rate is an intermediate target of monetary policy.6.f. The unemployment rate is an ultimate target of monetary policy.7. When banks ration credit, interest rates are no longer a good indication of existing market conditions.Credit is rationed when lending institutions limit the amount that their customers can borrow based on concerns that such borrowing may not be financially prudent. In this situation, the Fed should not use interest rate targets as a guide for its monetary policy, since interest rates no longer reflect true market conditions.8. The Fed has much more control over intermediate targets (money supply or interest rates) than it doesover ultimate targets (GDP, unemployment, or inflation). Changes in these intermediate targets do not have an immediate effect on the ultimate targets and therefore the Fed can easily reverse or re-enforce its policy measure. Because of the long lags associated with monetary policy, the Fed uses these2intermediate targets to get feedback on the effects of a policy change and the likeliness that a policy measure will achieve its ultimate goal. However, concentrating solely on intermediate targets does not guarantee that the ultimate objectives will be achieved.9. From the quantity theory of money equation MV = PY, we get%∆M + %∆V = %∆P + %∆Y ==> %∆P = %∆M - %∆Y + %∆V.If real GDP (Y) is assumed to grow at a rate of 3.5%, the Fed has to let money supply (M) grow at a rate of 3.5% to keep prices (P) stable, assuming that velocity (V) remains stable. The Fed can control nominal GDP through changes in nominal money supply only as long as the behavior of money demand (and thus velocity) is relatively predictable. The long-run GDP growth rate has been around2.25%, far below the3.5% mentioned here, and expansionary monetary policy will not achieve such ahigh growth rate. But there is a very close relationship between money supply changes and price changes in the long run, while real GDP growth is primarily influenced by other factors. If the Fed overestimates the rate at which potential GDP grows, then it is likely to stimulate the economy too much and induce high inflation. Therefore, nominal GDP targeting rather than real GDP targeting may be a better approach, since the former creates a policy tradeoff between unemployment and inflation. In other words, we will get less growth but also less inflation if potential GDP growth is overestimated.Technical Problems:1. Assume the Fed sells Treasury bills valued at $10 million to a bank.Fed Balance Sheet: Assets LiabilitiesGovt. securities - $10 Currency 0Other assets 0 Bank deposits - $10 Bank Balance Sheet: Assets LiabilitiesDeposits at the Fed - $10 Deposits 0Govt. securities + $10Other assets 0The bank has now lost $10 million in reserves (deposits at the Fed). If required reserves are no longer sufficient, then the bank will have to acquire new reserves.If a bank depositor buys the Treasury bills, then the balance sheet will be:Bank Balance Sheet: Assets LiabilitiesReserves - $10 Deposits - $10Other assets 0Again, the bank may have to make up for the loss of reserves.2. Assume the Fed buys $10 million worth of gold and then decides to sterilize the effect of thispurchase on the monetary base through open market operations.Fed Balance Sheet: Assets LiabilitiesGold + $10 Currency 0Other assets 0 Member bank deposit + $10 The purchase of gold increased the monetary base (bank reserves) by $10 million.Fed Balance SheetAfter Sterilization: Assets LiabilitiesGold + $10 Bank deposits (+10 -10) = $0Govt. securities - $103The sale of government securities to banks again decreased the monetary base (bank reserves) by $10 million, so there is no overall change in the monetary base.3.a. If the reserve-deposit ratio is 100%, then banks cannot create any loans and the money multiplier isequal to 1. This means that the Fed has total control over the money supply, since it has control over bank reserves. However, this would significantly change the banking industry, since banks no longer would be able to extend loans.3.b. Since banks would not be able to issue any loans, the assets side would contain only reserves.3.c. Banking could still remain profitable as long as banks were able to generate service charges to covertheir operating costs.4.In deciding whether monetary base targeting or interest rate targeting is better for the Fed in itsconduct of monetary policy, it would be good to know whether the goods sector or the money sector is more prone to disturbances. If most disturbances occur in the goods sector (assume the IS-curve shifts to the right), then monetary base targeting is better, since interest rate targets would force the Fed to aggravate the disturbance. Under interest rate targeting, the Fed would be forced to change money supply (shifting the LM-curve to the right) and aggregate demand would be changed even more. If most disturbances occur in the money sector (assume the LM-curve shifts to the left), then interest rate targeting is better, since the Fed can easily offset the disturbance. Under interest rate targeting the Fed could change money supply (shifting the LM-curve to the right again) without affecting aggregate demand.ii2i2i1 i1Y2 Y1 Y Y1 Y2 YAdditional Problems:1. How does an increase in the currency-deposit ratio affect the money multiplier? What is theeffect of an increase in the reserve-deposit ratio?The money multiplier is defined as mm = (1 + cu)/(cu + re), wherecu = CU/D = currency-deposit ratio, andre = R/D = reserve-deposit ratio.An increase in the currency-deposit ratio means that people hold more currency and banks have fewer funds to create deposits. Therefore the money multiplier decreases. An increase in the reserve-deposit ratio means that banks now hold more reserves, so fewer deposits can be created. Again, the money multiplier decreases.42. Assume that an increasing number of department and grocery stores accept credit and debitcards and more consumers use these cards to do their shopping. How will the money multiplier and money supply be affected?If more consumers make purchases using credit or debit cards rather than cash, then less currency is held and the currency-deposit ratio will be lower. This implies a larger money multiplier and, given a fixed stock of high-powered money, an increase in money supply.3. "The introduction of the FDIC after the Great Depression not only calmed the worries of thepublic but also made monetary policy easier for the Fed." Comment on this statement.The introduction of the FDIC lowered the public's fear of new bank failures. Consumer confidence in the banking system increased and people held less currency. Banks also were able to reduce their excess reserves, since they no longer feared a widespread bank run. The currency-deposit and the reserve-deposit ratios both declined, and the size of the money multiplier increased. In addition, the money multiplier became more stable, since consumers became less likely to panic after a bank failure occurred. The larger and the more stable the money multiplier, the easier it is for the Fed to control money supply by changing the monetary base through open market operations.4. Assume money supply (M) is $1,200 billion, total bank deposits (D) are $800 billion and therequired reserve-deposit ratio is 10%. What would the Fed have to do to lower money supply by 5%? Explain your answer.We know that M = CU + D ==> CU = M - D = 1,200 - 800 = 400.If we assume that banks do not hold excess reserves, thenR = (0.1)D = (0.1)800 = 80 and H = CU + R = 400 + 80 = 480.Thus the money multiplier is M/H = mm = 1,200/480 = 2.5.If the Fed wants to reduce money supply by 5% or $60 billion, it has to reduce high-powered money (H) by $24 billion, by selling $24 billion worth of Treasury bills. In other words,∆M = mm(∆H) == > - 60 = 2.5(∆H) ==> (∆H) = - 60/2.5 = - 245. Assume the currency-deposit ratio is 30%, the required reserve-deposit ratio is 8% and theexcess reserve-deposit ratio is 2%. How much would money supply change if the Fed made open market sales valued at $20 million?The money multiplier is defined as: M/H = mm = (1 + cu)/(cu + re).In this example the size of the money multiplier is equal tomm = (1 + 0.3)/(0.3 + 0.08 + 0.02) = (1.3)/(0.4) = 3.25.An open market sale valued at $20 million would decrease high-powered money (H) by $20 million. Therefore, money supply (M) would decrease by $65 million, since∆M = mm(∆H) = (3.25)(-20) = - 65.6. Assume bank deposits are $3,200 billion, the required reserve-deposit ratio is 10%, andcurrency outstanding is $400 billion. What should the Fed do to decrease money supply by $100 million?Ms = Cu + D = 400 + 3,200 = 3,600 and H = Cu + R = Cu + (0.1)D = 400 + 320 = 720==> money multiplier = Ms/H = mm = 3,600/720 = 5==> ∆Ms = mm(∆H) ==> - 100 = 5(∆H) ==> ∆H = - 20If the Fed wants to decrease money supply by $100 million, bank reserves have to be decreased by $20 million through the open market sale of government securities. (Note: The assumption was that excess reserves are zero, which may not be true.)7. True or false? Why?5"An open market sale raises the monetary base and therefore money supply."False. An open market sale occurs when the Fed sells government bonds to the private sector, primarily banks, in return for currency. Reserves held in the form of deposits at the Fed decrease, and therefore the monetary base (the stock of high-powered money) decreases as does money supply, since banks cannot loan out as much as previously.8. What problems would arise if the Fed tried to conduct open market operations via the stockmarket?Theoretically, the Fed could change high-powered money and thus the supply of money by buying and selling stocks. The problem, however, would be how to decide which stocks to buy and sell, since the Fed's actions would affect the values of the stocks being bought or sold.9. "Large open market sales may have a negative impact on the demand for money, the budgetsurplus, the income velocity of money, and consumption." Comment on this statement.Open market sales decrease bank reserves and therefore money supply. This increases interest rates, leading to a lower level of investment and income. Since income tax revenues decrease in a recession, the budget surplus will also decrease. Since interest rates are higher, the interest payments on the national debt will increase. A lower level of income means a lower level of consumption. The income velocity of money generally declines in a recession. However, the decline in money occurs before the decline in income. Thus we first see an increase in velocity in the short run, followed by a decrease.10. Which is the most useful tool for the Fed to conduct its monetary policy? In your answerdiscuss the advantages and disadvantages of each of the tools that the Fed has at its disposal. The Fed has three basic tools to conduct monetary policy are open market operations, discount rate changes, and reserve requirement changes.Open market operations are used most often by the Fed since it can be undertaken every business day, can be undertaken to a large or small degree, and can be easily reversed. Bank reserves are immediately affected to a desired degree with the initiative lying solely with the Fed.The discount rate can be used as a signal for a change in monetary policy, but often a change in the discount rate simply reflects an adjustment to existing money market conditions. The disadvantage of using the discount rate is that it is up to banks to change the level of bank reserves. Bank reserves only change when banks borrow more or less from the Fed. Since this behavior cannot be anticipated, bank reserve changes cannot be accurately anticipated.Reserve requirement changes are used only rarely, since this is an extremely blunt tool. A reserve requirement change will affect the money multiplier and have a huge effect on money supply. Generally banks are given ample time to adjust to changes.11. Comment on the following statement:"Changes in the discount rate are always a sign that the Fed has changed its monetary policy." The discount rate is the rate at which banks can borrow from the Fed. The federal funds rate is the rate at which banks can borrow from each other. Banks generally prefer to borrow at the lowest rate. They do not like to borrow too often or too much from the Fed, however, since the Fed may then question their way of doing business. But if the demand for bank reserves increases and the difference between the federal funds rate and the discount rate gets too large, banks have an incentive to borrow from the Fed more often than usual. In this case total bank reserves will increase more than the Fed would like. As a result, the Fed may adjust the discount rate to bring it more in line with the federal funds rate. Therefore, while an increase in the discount rate may signal a shift in the Fed's policy, it may also simply reflect the Fed's response to a change in money market conditions.612. In 1991-92, the Fed repeatedly lowered the discount rate, but failed to stimulate the economy.Explain this fact. Subsequently, the Fed lowered the reserve requirements for banks. In your opinion, what was the Fed's objective in doing this, and was the objective achieved?Lowering the discount rate is not always successful in increasing money supply (and thus stimulating the economy), since it requires that banks take the initiative to change bank reserves. In 1991-92, the U.S. was in a recession and negative business expectations persisted. Many banks needed to recover from loan losses they had incurred and did not want to extend credit even though they were encouraged to do so by the Fed.The Fed finally lowered the reserve requirements for banks in a further effort to stimulate the economy but also to increase the profitability of banks. Banks do not earn interest on the reserves they hold, so a decrease in reserve requirements allowed them to increase their earnings and reduce their portfolio risk by buying Treasury-bills. While the economy was not immediately stimulated by new loans, at least the profitability of banks increased, creating more stability within the banking system.13. "Open market sales are more effective than increasing the discount rate in changing moneysupply." Comment. In your answer explain the short-run effects of restrictive monetary policy on velocity, the budget surplus, and national saving.With open market operations, the Fed has the initiative and bank reserves are immediately affected. Open market operations can be undertaken to a small or large extent on every business day, the Fed can determine the level of impact on bank reserves, and the Fed's actions can be easily reversed. Discount rate changes affect banks' cost of borrowing from the Fed, but leave the initiative to react to the banks. Thus, the Fed cannot easily predict the exact effect on bank reserves. For example, in 1991 the Fed changed the discount rate 15 times but banks did not borrow more from the Fed or increase their lending due to unfavorable economic conditions. If the Fed restricts money supply, interest rates will increase, leading to a decrease in economic activity. Initially, the income velocity (V = PY/M) will increase due to the lower money supply (M), but it will take time to affect income. But as national income (Y) decreases, income velocity will decline. Other results will include a decrease in the budget surplus (due to lower tax revenues) and national saving (due to lower income and a lower government surplus).14. Assume the Fed lowered the discount rate. How would personal saving, the budget surplus andaggregate money demand be affected?A lower discount rate is intended to encourage banks to borrow more from the Fed. It is not always clear that banks will respond as expected, but if they do, bank reserves will increase and so will money supply, as banks increase their lending activity. This will lower interest rates, leading to an increase in investment and national income. Personal saving will increase with a higher income level. Similarly, tax revenues will go up, increasing the budget surplus. Lower interest rates and higher income will increase money demand. (We also can see this from the fact that money supply has increased. Since the money sector has to move into a new equilibrium, money demand has to go up if money supply is increased.)15. Should you expect the federal funds rate to be above the discount rate or vice versa? Explain. The Fed is the lender of last resort and banks can always borrow from the Fed if the need arises. When banks borrow from the Fed, they are charged a rate called the discount rate. But banks also have the option to borrow from each other at the federal funds rate. Banks generally prefer to borrow at the lowest rate possible. However, they do not like to borrow too heavily from the Fed, since the Fed is a regulator of banks. Banks fear that their behavior will be questioned if the Fed takes notice and thus prefer to borrow from each other. In doing so, they drive the federal funds rate above the discount rate.716. "Reserve requirements act as an unfair tax on banks." Comment on this statement.Banks are forced to hold their reserves either as vault cash or as deposits at the Fed earning no interest in either case. Since other financial institutions have no such reserve requirement, it could be argued that this unfairly taxes banks. On the other hand, reserves guarantee a certain amount of liquidity for the banking system, which may be necessary, should there be a run on banks. The reserves held as deposits at the Fed also serve to facilitate the check clearing process. For these reasons, the tax can be viewed as necessary and therefore less "unfair."17. Does the Fed have control over the federal funds rate and over bank reserves? If so, can the Fedcontrol both simultaneously?The Fed has indirect control over the federal funds rate, since it has control over the supply of total bank reserves in the banking system through open market operations. However, the Fed cannot control the demand for bank reserves. If the demand for bank reserves increases, the federal funds rate will rise. If the Fed chooses to peg the federal funds rate, it has to create additional bank reserves via open market purchases. On the other hand, if the Fed chooses to control the level of bank reserves, it has to let the federal funds rate fluctuate. Therefore, the Fed cannot control the federal funds rate and the level of bank reserves simultaneously.18. "By lowering the reserve requirements for banks, the Fed reduces the budget deficit, nationalsaving, and the income velocity of money." Comment on this statement.If the Fed lowers the reserve requirement, banks have more money to lend out and can thus increase their earnings by making more loans or buying T-bills. If banks extend their loans, then money supply will increase and interest rates will decrease, stimulating investment and national income. Saving will increase with a higher level of income. Similarly, tax revenues will go up, reducing the budget deficit. Interest payments on the national debt will also decrease with lower interest rates, which will also help to lower the deficit. Velocity will initially decrease, since money supply will increase before income. But as income increases, then velocity will increase again. Ultimately, velocity may not change by much, since the income elasticity of money demand is close to one in the long run.19. "Restrictive monetary policy over a long time period will lead to lower interest rates."Comment on this statement.Long-run effects of monetary policy are different from short-run effects. Restrictive monetary policy leads to higher interest rates in the short run due to less liquidity (liquidity effect). But higher interest rates will reduce aggregated demand, which reduces prices and national income. Thus the level of interest rates will start to decline again (price-income effect). Lower prices will eventually lead to lower inflationary expectations and thus lower nominal interest rates (price-anticipation effect). In the end, real interest rates (i r) will return to their original level and nominal interest rates (i n) will be lower, since the inflation rate (π) is lower. This is shown in the so-called Fisher equation: i n = i r + π.20. "The elimination of required reserves on bank deposits would decrease the Fed's control overmoney supply. But if money supply increased uncontrollably, then high rates of inflation would result." Comment on the following statement.The Fed has a number of policy instruments at its disposal to control the level of bank reserves (and thus money supply). The required-reserve ratio is only one such instrument. The Fed can always influence bank reserves through the use of open market operations. Even if reserve requirements are abolished, the money multiplier will always have a finite value, since banks will always hold some (excess) reserves to meet their daily cash needs and emergency needs. If the reserve requirement were eliminated, the money multiplier would become larger, since banks would not choose to voluntarily hold as many reserves as the Fed required. However, large-scale open market operations would still enable the Fed to exercise great influence over bank reserves and therefore money supply.8。

多恩布什宏观经济学第十版课后习题复习资料08

多恩布什宏观经济学第十版课后习题复习资料08

•CHAPTER 8Solutions to the Problems in the Textbook:Conceptual Problems:1. The first question you should ask yourself as a policy maker is whether a disturbance is transitory orpersistent. You should then ask yourself how long it would take to put a suggested policy measure into effect and how long it will take for the policy to have the desired effect on the economy. In addition, you need to know how reliable the estimates of your advisors are about the effects of the policy. If a disturbance is small and probably transitory, you may be best advised to do nothing, because any measure you take is likely to have its effect after the economy has recovered. Therefore your action might only further aggravate the problem.2.a. The inside lag is the time it takes after an economic disturbance has occurred to recognize andimplement a policy action that will address the disturbance.2.b. The inside lag is divided into three parts. First, there is the recognition lag, that is, the time it takes forpolicy makers to realize that a disturbance has occurred and that a policy response is warranted.Second, there is the decision lag, that is, the time it takes to decide on the most desirable policy response after a disturbance is recognized. Finally, there is the action lag, that is, the time it takes to actually implement the policy measure.2.c. Inside lags are shorter for monetary policy than for fiscal policy since the FOMC meets on a regularbasis to discuss and implement monetary policy. Fiscal policy, on the other hand, has to be initiated and passed by both houses of the U.S. Congress and this can be a lengthy process. The exceptions are the so-called automatic stabilizers; however, they only work well for small and transitory disturbances2.d Automatic stabilizers have no inside lag; they are endogenous and function without specificgovernment intervention. Examples are the income tax system, the welfare system, unemployment insurance, and the Social Security system. They all reduce the amount by which output changes in response to an economic disturbance.3.a. The outside lag is the time it takes for a policy action, once implemented, to have its full effect on theeconomy.3.b. Generally, the outside lag is a distributed lag with a small immediate effect and a larger overall effectover a longer time period. The effect is spread over time, since aggregate demand responds to any1 / 1policy change only slowly and with a lag.3.c. Outside lags are longer for monetary policy since monetary policy actions affect short-term interestrates most directly, while aggregate demand depends heavily on lagged values of income, interest rates, and other economic variables. A change in government spending, however, immediately affects aggregate demand.4. Fiscal policy has smaller outside lags, but significant inside lags. Monetary policy, on the other handhas smaller inside lags and longer outside lags. Therefore large open market operations should be undertaken to get an immediate effect, but they should be partially reversed over time to avoid a large long-run effect. If the shock is sufficiently transitory and small, policy makers may be best advised not to undertake any policy change at all.5.a. An econometric model is a statistical description of all or part of the economy. It consists of a set ofequations that are based on past economic behavior.5.b. Econometric models are generally used to forecast the behavior of the economy and the effects ofalternative policy measures.5.c. There is considerable uncertainty about how well econometric models actually represent the workingsof the economy. There is also great uncertainty about the expectations of firms and consumers and their reactions to policy changes. Any policy is bound to fail if the information on which it was based is poor.6.The answer to this question is student specific. The main difficulties of stabilization policy arise fromthree sources. First, policy always works with lags. Second, the outcome of any policy depends on the way the private sector forms expectations and how those expectations affect the public's behavior.Third, there is considerable uncertainty about the structure of the economy and the shocks that hit it.It can be argued that a monetary policy rule would greatly reduce uncertainty about the Fed's policy responses. If the government behaved in a consistent way, then the private sector would also behave more consistently and economic fluctuations could be greatly reduced. A monetary growth rule would also reduce any political pressure the administration might exert on the Fed. It is often initially unclear whether a disturbance is temporary or persistent and a monetary policy rule would prevent policy mistakes in cases where the disturbance is, in fact, temporary. If active monetary policy is applied to a temporary disturbance, then the lags involved will guarantee that the economy will1 / 1actually be destabilized.On the other hand, the workings of the economy are not completely understood and events cannot always be predicted. Thus it is difficult to argue for a fixed policy rule. Unanticipated large disturbances warrant an activist policy, especially if they appear to be persistent. It is also possible to construct a more activist monetary growth rule. For example, Equation (8) suggests that the annual monetary growth rate should be increased by two percent for every one percent that unemployment increases above its natural rate. Such a rule is based on the quantity theory of money equation (which relates money supply growth to the growth of nominal GDP) and on Okun's law (which relates the unemployment rate to economic growth). Obviously, because of the long lags for monetary policy, any monetary growth rule will work much better in the long run than in the short run.Fiscal policy rules may make more sense than monetary policy rules, since fiscal policy has long inside lags but shorter outside lags. In a way, built-in stabilizers, although generally not considered "rules", already provide some stability without any inside lag. Many of the arguments against monetary policy rules are also valid for fiscal policy rules and many economists oppose them. The frequently proposed constitutional amendment requiring an annually balanced budget is an example of a fiscal policy rule. There are significant problems associated with such an amendment, since it would greatly limit the government's ability to undertake active fiscal stabilization policy.7. The arguments for a constant growth rate rule for money are based on the quantity theory of moneyequation, that is,MV = PY.From this equation we can derive%∆P = %∆M - %∆Y + %∆V.If the long-run trend rate of real output (Y) and the long-run trend of velocity (V) are assumed to be fairly stable, and if wages and prices are sufficiently flexible, then a constant monetary growth rate (M) would insure a constant rate of inflation, that is, a constant rate of change in the price level (P).Also, since monetary policy has long outside lags, active monetary policy can actually be more destabilizing than stabilizing. In addition, since we do not know exactly how the economy works or may react to specific policies, it is best to follow a rule rather than undertake actions that have uncertain outcomes. However, rules are not without problems, as they would not allow flexibility in responding to major disturbances.1 / 18. Dynamic inconsistency occurs if, after having committed themselves to a specific policy actiondesigned to achieve a long-run objective, policy makers find themselves in a situation where it seems advantageous to abandon their original policy, in order to achieve a short-run goal. Such action will impede the long-run objective.9. Real GDP targeting is the best option if the primary policy goal of monetary policy is to achieve fullemployment. If policy makers forecast potential GDP correctly, then full employment combined with low inflation can be achieved. However, real GDP targeting bears the greater risk that the secondary goal of achieving a low inflation rate will be missed. If the rate at which potential GDP grows is overestimated, then policy makers may stimulate the economy too much. In this case, they will not be successful in achieving price stability. By targeting nominal GDP, the central bank creates a policy tradeoff between inflation and unemployment. If the rate at which potential GDP grows is overestimated and policy makers stimulate the economy too much, we will get less growth but also less inflation than under real GDP targeting. Which targeting approach should be chosen depends greatly on how steep or flat the Phillips curve is perceived to be.Technical Problems:1. If actual GDP is expected to be $40 billion below the full-employment level and the size of thegovernment spending multiplier is 2, then government spending should be increased by $20 billion over its current level. For the next period, when actual GDP is expected to be $20 billion below potential, government spending should be cut by $10 billion from its new level, that is, to $10 billion over its original level. In period three, when actual GDP is expected to be at its full-employment level, the level of government spending should again be cut by $10 billion from the last period's level to bring it back to the original level of Period 0.2.a. If there is a one-period outside lag for government spending, then nothing can be done to close thecurrent GDP-gap. The government should decide to spend $10 billion more for the next period and reduce spending again to its original level after that.2.b. Graph I below shows the path of GDP for Problem 1 with no outside lag and Graph II shows the pathof GDP for problem 2.a. with a one-period outside lag. In each of the graphs the path of actual GDP is shown, first assuming that no policy action takes place and then assuming that the policies proposed in Problems 1 and 2.a. are undertaken.1 / 1Graph IGDP GDPpotential GDP potential GDP0 time 0 timeGDP with fiscal policy GDP without fiscal policyGraph IIGDP GDPpotential GDP potential GDP0 time 0 timeGDP with fiscal policy GDP without fiscal policy3.a. Since the government multiplier for the first period is 1, the level of government spending must beincreased by G = $40 billion to close the GDP-gap of $40 billion. But since the government multiplier in the next period for the amount spent in this period is 1.5, the effect of an increase in government spending in the first period by $40 billion would be an increase in GDP by $60 billion in the second period.3.b. For the second period a GDP-gap of $20 billion is expected. However, as we saw in 3.a., GDP willincrease by $60 billion in the second period if the government increases spending by $40 billion in the first period. Therefore, the government has to reduce spending in the second period by $40 billion from its new level (back to its original level), since the multiplier for a spending change in the same period is 1.3.c. In this problem, fiscal policy has an outside lag. This means that the effect of an increase ingovernment spending is felt both in the period in which the spending increase takes place and (to an even larger degree) in the following period. The increase in government spending needed to close the1 / 1GDP-gap in the first period is guaranteed to overshoot the desired goal in the next period. Thus the government will be forced to reverse its increase in spending to the original level in the second period to offset the destabilizing effect. In a case like this, the government has to be much more active in its fiscal policy than in a situation where no distributed lag exists.4. If there is uncertainty about the size of the multiplier, then fiscal policy becomes much morecomplicated. If the multiplier is 1, then an increase in government spending by $40 billion will close the GDP-gap in the first period. If the multiplier is 2.5, we will overshoot potential GDP by $60 billion. An increase in spending by 40/2.5 = $16 billion is optimal if the multiplier is 2.5. Thus a cautious government will probably increase spending by no more than $16 billion in the first period, and then reduce the level of spending by $8 billion in the next period ($8 billion above the original level). Such a policy action is designed to close the GDP-gap to some degree over the first two periods while never overshooting potential GDP. In Period 3 we will again be back at the full-employment level. The extent to which a less cautious government might exceed these suggested spending increases depends largely on that government's level of concern about unemployment versus inflation.5. To follow an established rule for its policy, the Fed needs to know the source of each disturbance. If adisturbance comes from the goods sector, it is better to have a monetary growth target; if the disturbance comes from the money sector, it is better to have an interest rate target.a. Assume a disturbance comes from the money sector. If an increase in money demand increases theinterest rate, the Fed should try to maintain a constant interest rate by increasing the supply of money.This will re-establish the old equilibrium values of the interest rate and output and effectively offset the disturbance.b. Assume a disturbance comes from the goods sector. If an increase in autonomous investmentincreases the interest rate, then it is not advisable to maintain a constant interest rate. Trying to lower the interest rate again by increasing the money supply would aggravate the disturbance. On the other hand, maintaining a constant money supply, while not offsetting the disturbance, will at least not make things worse.6.a. Students will have to check the Federal Reserve Bulletin in early 2000 and compare the forecasts ofthe Federal Reserve Board with the actual performance of the economy in 1999.6.b. Regardless of how detailed it is, no econometric model can accurately represent the economy, sincewe do not completely understand the way the economy works. Therefore, we can never expect perfect1 / 1forecasts. It is impossible to incorporate all the relevant information on which individuals and firms base their expectations about the future and to determine how these expectations affect actions in any given situation. Forecasts are generally based on the information available at the time, which may be flawed or outdated. In addition, any unexpected change, such as a supply shock, an unanticipated international change, or an unanticipated domestic policy change, can render the initial predictions wrong.1 / 1。

多恩布什宏观经济学答案

多恩布什宏观经济学答案

Chapter 2 national income accountingTechnical Problems1.The text calculates the change in real GDP in 1996 prices in the following way:[RGDP04 - RGDP96]/RGDP96 = [3.50 - 1.50]/1.50 = 1.33 = 133%.To calculate the change in real GDP in 2004 prices, we first have to calculate the GDP of 1996 in 2004 prices.Thus we take the quantities consumed in 1996 and multiply them by the prices of 2004, as follows:B eer 1 at $2.00 = $2.00Skittles 1 at $0.75 = $0.75_______________________________Total $2.75The change in real GDP can now be calculated as [6.25 - 2.75]/2.75 = 1.27 = 127%.We can see that the growth rate of real GDP calculated this way is roughly the same as the growth rate calculated above.2.a. The relationship between private domestic saving, private domestic investment, the budget deficit, and netexports is shown by the following identity:S - I ≡ (G + TR - TA) + NX.Therefore, if we assume that transfer payments (TR) remain constant, an increase in taxes (TA) has to be offset either by an increase in government purchases (G), an increase in net exports (NX), or a decrease in the difference between private domestic saving (S) and private domestic investment (I).2.b.From the equation YD ≡ C + S it follows that an increase in disposable income (YD) will be reflected in anincrease in consumption (C), saving (S), or both.2.c.From the equation YD ≡ C + S it follows that when either consumption (C) or saving (S) increases, disposableincome (YD) must increase as well.3.a. Since depreciation is defined as D = I g - I n = 800 - 200 = 600 ==>NDP = GDP - D = 6,000 - 600 = 5,400.3.b.From GDP = C + I g + G + NX ==> NX = GDP - C – I g - G ==>NX = 6,000 - 4,000 - 800 - 1,100 = 100.3.c.BS = TA - G - TR ==> (TA - TR) = BS + G ==> (TA - TR) = 30 + 1,100 = 1,1303.d.YD = Y - (TA - TR) = 6,000 - 1,130 = 4,8703.e. S = YD - C = 4,870 - 4,000 = 8704.a. S = YD - C = 5,100 - 3,800 = 1,3004.b.From S - I = (G + TR - TA) + NX ==> I = S - (G + TR - TA) - NX = 1,300 - 200 - (-100) = 1,200.2704.c.From Y = C + I + G + NX ==> G = Y - C - I - NX ==>G = 6,000 - 3,800 - 1,200 - (-100) = 1,100.Also: YD = Y - TA + TR ==> TA - TR = Y - YD = 6,000 - 5,100 ==> TA - TR = 900From BS = TA - TR - G ==> G = (TA - TR) - BS = 900 - (-200) ==> G = 1,100.5.According to Equation (2) in the text, the value of total output (in billions of dollars) can be calculated as: Y =labor payments + capital payments + profits = $6 + $2 + $0 = $8.6.a.Since nominal GDP is defined as the market value of all final goods and services currently produced in thiscountry, we can only measure the value of the final product (bread), and therefore we get $2 million (since 1 million loaves are sold at $2 each).6.b.An alternative way of measuring GDP is to calculate all the value added at each step of production. The totalvalue of the ingredients used by the bakeries can be calculated as:1,200,000 pounds of flour ($1 per pound) = 1,200,000100,000 pounds of yeast ($1 per pound) = 100,000100,000 pounds of sugar ($1 per pound) = 100,000100,000 pounds of salt ($1 per pound) = 100,000__________________________________________________________= 1,500,000Since $2,000,000 worth of bread is sold, the total value added at the bakeries is $500,000.7.If the CPI increases from 2.1 to 2.3, the rate of inflation can be calculated in the following way:rate of inflation = (2.3 - 2.1)/2.1 = 0.095 = 9.5%.The CPI often overstates inflation, since it is calculated by using a fixed market basket of goods and services.But the fixed weights in the CPI's market basket cannot capture the tendency of consumers to substitute away from goods whose relative prices have increased. Quality improvements in goods also often are not adequately taken into account. Therefore, the CPI will overstate the increase in consumers' expenditures.8.The real interest rate (r) is defined as the nominal interest rate (i) minus the rate of inflation (π). Therefore thenominal interest rate is the real interest rate plus the rate of inflation, ori = r + π = 3% + 4% = 7%.Chapter 3Growth theory, exogenous.1.a.According to Equation (2), the growth of output is equal to the growth in lab or times labor’s share ofincome plus the growth of capital times capital’s share of income plus the rate of technical progress, that is,∆Y/Y = (1 - θ)(∆N/N) + θ(∆K/K) + ∆A/A, where2711 - θ is the share of labor (N) and θ is the share of capital (K). Therefore, if we assume that therate of technological progress is zero (∆A/A = 0), output grows at an annual rate of 3.6 percent, since ∆Y/Y = (0.6)(2%) + (0.4)(6%) + 0% = 1.2% + 2.4% = + 3.6%,1.b.The so-called "Rule of 70" suggests that the length of time it takes for output to double can becalculated by dividing 70 by the growth rate of output. Since 70/3.6 = 19.44, it will take just under 20 years for output to double at an annual growth rate of 3.6%,1.c.Now that ∆A/A = 2%, we can calculate economic growth as∆Y/Y = (0.6)(2%) + (0.4)(6%) + 2% = 1.2% + 2.4% + 2% = + 5.6%.Thus it will take 70/5.6 = 12.5 years for output to double at this new growth rate of 5.6%.2.a.According to Equation (2), the growth of output is equal to the growth in labor times the labor shareplus the growth of capital times the capital share plus the growth rate of total factor productivity, that is,∆Y/Y = (1 - θ)(∆N/N) + θ(∆K/K) + ∆A/A, where1 - θ is the share of labor (N) and θ is the share of capital (K). In this example θ = 0.3; therefore,if output grows at 3% and labor and capital grow at 1% each, we can calculate the change in total factor productivity in the following way3% = (0.7)(1%) + (0.3)(1%) + ∆A/A ==> ∆A/A = 3% - 1% = 2%,that is, the growth rate of total factor productivity is 2%.2.b.If both labor and the capital stock are fixed, that is, ∆N/N = ∆K/K = 0, and output grows at 3%, thenall the growth has to be contributed to the growth in total factor productivity, that is, ∆A/A = 3%.3.a.If the capital stock grows by ∆K/K = 10%, the effect on output will be an additional growth rate of∆Y/Y = (0.3)(10%) = 3%.3.b.If labor grows by ∆N/N = 10%, the effect on output will be an additional growth rate of∆Y/Y = (0.7)(10%) = 7%.3.c.If output grows at ∆Y/Y = 7% due to an increase in labor by ∆N/N = 10% and this increase in labor isentirely due to population growth, then per-capita income will decrease and people’s welfare will decrease, since∆y/y = ∆Y/Y - ∆N/N = 7% - 10% = - 3%.2723.d.If the increase in labor is due to an influx of women into the labor force, the overall population doesnot increase, and income per capita will increase by y/y = 7%. Therefore people's welfare (or at least their living standard) will increase.4.Figure 3-4 shows output per head as a function of the capital-labor ratio, that is, y = f(k). Thesavings function is sy = sf(k) and it intersects the (n + d)k-line, representing the investment requirement. At this intersection, the economy is in a steady-state equilibrium. Now let us assume that the economy is in a steady-state equilibrium before the earthquake hits, that is, the capital-labor ratio is currently k*. Assume further, for simplicity, that the earthquake does not affect pe oples’ savings behavior.If the earthquake destroys one quarter of the capital stock but less than one quarter of the labor force, then the capital-labor ratio will fall from k* to k1 and per-capita output will fall from y* to y1.Now saving is greater than the investment requirement, that is, sy1 > (d + n)k1, and the capital stock and the level of output per capita will grow until the steady state at k* is reached again.However, if the earthquake destroys one quarter of the capital stock but more than one quarter of the labor force, then the capital-labor ratio will increase from k* to k2. Saving (and gross investment) now will be less than the investment requirement and thus the capital-labor ratio and the level of output per capita will fall until the steady state at k* is reached again.If exactly one quarter of both the capital stock and the labor stock are destroyed, then the steady state will be maintained, that is, the capital-labor ratio and the output per capita will not change.If the severity o f the earthquake has an effect on peoples’ savings behavior, the savings function sy = sf(k) will move either up or down, depending on whether the savings rate (s) increases (if people save more, so more can be invested in an effort to rebuild) or decreases (if people save less, since they decide that life is too short not to live it up). But in either case, a new steady-state equilibrium will be reached.k1k k2 k5.a.An increase in the population growth rate (n) affects the investment requirement. As n gets larger, the(n + d)k-line gets steeper. As the population grows, increases in saving and investment will be required to equip new workers with the same amount of capital that existing workers already have.273Since the population will now be growing faster than output, income per capita (y) will decrease anda new optimal capital-labor ratio will be determined by the intersection of the sy-curve and the new(n1 + d)k-line. Since per-capita output will fall, we will have a negative growth rate in the short run.However, the steady-state growth rate of output will increase in the long run, since it will be determined by the new and higher rate of population growth.y oy1k1k o k5.b.Starting from an initial steady-state equilibrium at a level of per-capita output y*, the increase in thepopulation growth rate (n) will cause the capital-labor ratio to decline from k* to k1. Output per capita will also decline, a process that will continue at a diminishing rate until a new steady-state level is reached at y1. The growth rate of output will gradually adjust to the new and higher level n1.yy*y1t o t1tkk*k1t o t1t6.a.Assume the production function is of the formY = F(K, N, Z) = AK a N b Z c==>274∆Y/Y = ∆A/A + a(∆K/K) + b(∆N/N) + c(∆Z/Z), with a + b + c = 1.Now assume that there is no technological progress, that is, ∆A/A = 0, and that capital and labor grow at the same rate, that is, ∆K/K = ∆N/N = n. If we also assume that all available natural resources are fixed, such that ∆Z/Z = 0, then the rate of output growth will be∆Y/Y = an + bn = (a + b)n.In other words, output will grow at a rate less than n since a + b < 1, and output per worker will fall.6.b.If there is technological progress, that is, ∆A/A > 0, then output will grow faster than before, namely∆Y/Y = ∆A/A + (a + b)n.If ∆A/A < cn, output will grow at a lower rate than n, in which case output per worker will still decrease.If ∆A/A = cn, output will grow at the same rate as n, in which case output per worker will remain the same.But if ∆A/A > cn, output will grow at a rate higher than n, in which case output per worker will increase.6.c.If the supply of natural resources is fixed, then output can only grow at a rate that is smaller than therate of population growth and we should expect limits to growth as we run out of natural resources.However, if the rate of technological progress is sufficiently large, then output can grow at a rate faster than population, even if we have a fixed supply of natural resources.7.a.If the production function is of the formY = K1/2(AN)1/2,and A is normalized to 1, we haveY = K1/2N1/2 .In this case, capital's and labor's shares of income are both 50%.7.b.This is a Cobb-Douglas production function.7.c. A steady-state equilibrium is reached when sy = (n + d)k.From Y = K1/2N1/2 ==> Y/N = K1/2N-1/2==> y = k1/2 ==> sk1/2 = (n + d)k==> k-1/2 = (n + d)/s = (0.07 + 0.03)/(.2) = 1/2 ==> k1/2 = 2 = y ==> k = 4 .7.d.At the steady-state equilibrium, output per capita remains constant, since total output grows at thesame rate as the population (7%), as long as there is no technological progress, that is, ∆A/A = 0. But275if total factor productivity grows at ∆A/A = 2%, then total output will grow faster than population, that is, at 7% + 2% = 9%, so output per capita will grow at 2%.8.a.If technological progress occurs, then the level of output per capita for any given capital-labor ratioincreases. The function y = f(k) increases to y = g(k), and thus the savings function increases from sf(k) to sg(k).8.b.Since g(k) > f(k), it follows that sg(k) > sf(k) for each level of k. Therefore, the intersection of thesg(k)-curve with the (n + d)k-line is at a higher level of k. The new steady-state equilibrium will now be at a higher level of saving and output per capita, and at a higher capital-labor ratio.8.c.After the technological progress occurs, the level of saving and investment will increase until a newand higher optimal capital-labor ratio is reached. The investment ratio will increase in the transition period, since more investment will be required to reach the higher optimal capital-labor ratio.9.The Cobb-Douglas production function is defined asY = F(N, K) = AN1-θKθ.The marginal product of labor can then be derived asMP N = (∆Y)/(∆N) = (1 - θ)AN-θKθ = (1 - θ)AN1-θKθ/N = = (1 - θ)(Y/N)== > labor's share of income = [MP N*N]/Y = [(1 - θ)(Y/N)](N/Y) = (1 - θ).Chapter 4Growth theory, endogenous1.a. A production function that displays both a diminishing and a constant marginal product of capital canbe displayed by drawing a curved line (as in an exogenous growth model), followed by an upward-sloping line (as in an endogenous growth model). Such a graph is depicted below.1.b.The first equilibrium (Point A in the graph below) is a stable low-income steady-state equilibrium.Any deviation from that point will cause the economy to eventually adjust again at the same steady-state income level (and capital-output ratio). The second equilibrium (Point B) is an unstable high-income steady-state equilibrium. Any deviation from that point will lead to either a lower income steady-state equilibrium back at Point A (if the capital-labor ratio declines) or ongoing growth (if the capital-labor ratio increases). In the latter case, not only total output but also output per capita continues to grow.1.c. A model like the one in this question can be used to explain how some countries find themselves insituations with no growth and low income while others have ongoing growth and a high level of income. In the first case, a country may have invested mostly in physical capital, leading to some short-term growth at the expense of long-term growth. In the second case, a country may have invested not only in physical capital but also in human capital (education, skills, and training), reaping significant social returns.2762.a.If population growth is endogenous, that is, if a country can influence the rate of population growththrough government policies, then the investment requirement is no longer a straight line. Instead it is curved as depicted below.2.b.The first equilibrium (Point A) is a stable steady-state equilibrium. This is a situation of low incomeand high population growth, indicating that the country is in a poverty trap. The second equilibrium (Point B) is an unstable steady-state equilibrium. This is a situation of medium income and low population growth. The third equilibrium (Point C) is a stable steady-state equilibrium. This is a situation of high income and low population growth. In none of these three cases do we have ongoing growth. For any capital stock k < k B, the economy will adjust to k A, but for any capital stock k > k b (even for k > k c), the economy will adjust to k B. During the adjustment process to any of these two steady-state equilibria, the change in output per capita only will be transitory.2.c.To escape the poverty trap (Point A), a country has several possibilities: First, it can somehow find themeans to increase the capital-labor ratio above a level consistent with Point B (perhaps by borrowing funds or seeking direct foreign investment). Second, it can increase the savings rate such that the savings function no longer intersects the investment requirement curve at either Point A or Point B.Third, it can decrease the rate of population growth through specifically designed policies, such that the investment requirement shifts down and no longer intersects with the savings function at Points A or B.3.a.If we incorporate endogenous population growth into a two-sector model in Problem 2, we get acurved investment requirement line and a production function with first a diminishing and then a constant marginal product of capital as depicted below. (Note that the savings function has the same shape as the production function.)3.b. Here we should have four intersections of the savings function sf(k) and the investment requirement[n(y)+d]k. The first equilibrium (at Point A) is a stable low-income steady-state equilibrium. Any deviation from that point will cause the economy to eventually adjust again at the same steady-state income level (and capital-output ratio). The second equilibrium (at Point B) is an unstable low-income equilibrium. Any deviation from that point will lead to either a lower income steady-state equilibrium at Point A (if the capital-labor ratio declines) or a higher income steady-state equilibrium at Point C (if the capital-labor ratio increases). Since Point C is a stable equilibrium, the economy will settle back at that point again whether the capital stock increases or declines. Point D is again an unstable equilibrium but at a high level of income. Any deviation from that point will lead to either a lower income steady-state equilibrium at Point C (if the capital-labor ratio declines) or ongoing growth (if the capital-labor ratio increases).3.c.This model is more inclusive than either of the two models discussed previously and therefore hasgreater explanatory power. While the graphical analysis is far more complicated, we can now see more clearly that a poor country cannot escape the poverty trap at Point A unless it somehow succeeds in increasing the capital-labor ratio (and thus per-capita income) beyond the level at Point B.4.a.The production function is of the formY = K1/2(AN)1/2 = K1/2(4[K/N]N)1/2= K1/2(4K)1/2 = 2K.From this we can see that a = 2 since277Y = Y/N = 2(K/N) == > y = 2k.4.b.Since a = y/k = 2, it follows that the growth rate of output and capital is∆y/y = ∆k/k = g = sa - (n + d) = (0.1)2 - (0.02 + 0.03) = 0.15 = 15%.4.c.The term "a" in the equation above stands for the marginal product of capital. By assuming that thelevel of labor-augmenting technology (A) is proportional to the capital-labor ratio (k), it is implied that the level of technology depends on the amount of capital per worker that we have, which may not be realistic.4.d.In this model, we have a constant marginal product of capital and therefore we have an endogenousgrowth model.5.a.The production function is of the formY = K1/2N1/2==> Y/N = (K/N)1/2 ==> y = k1/2.From k = sy/(n + d) = sk1/2/(n +d) ==> k1/2 = s/(n + d)==> y* = s/(n + d) = (0.1)/(0.02 + 0.03) = 2==> k* = sy*/(n + d) = (0.1)(2)/(0.02 + 0.03) = 4.5.b.Steady-state consumption equals steady-state income minus steady-state saving (or investment), thatis,c* = y – sy = f(k*) - (n + d)k* .The golden-rule capital stock corresponds to the highest permanently sustainable level of consumption. Steady-state consumption is maximized when the marginal increase in capital produces just enough extra output to cover the increased investment requirement.From c = k1/2 - (n + d)k ==> (∆c/∆k) = (1/2)k-1/2 - (n + d) = 0==> k-1/2 = 2(n + d) = 2(.02 + .03) = .1==> k1/2 = 10 ==> k = 100.Since k* = 4 < 100, we have less capital at the steady state than the golden rule suggests.5.c.From k = sy/(n + d) = sk1/2/(n + d) ==> s = k1/2(n + d) = 10(0.05) = 0.5.5.d.If we have more capital than the golden rule suggests, we are saving too much and do not have theoptimal amount of consumption.Chapter 9Income and spending2781.a. AD = C + I = 100 + (0.8)Y + 50 = 150 + (0.8)YThe equilibrium condition is Y = AD ==>Y = 150 + (0.8)Y ==> (0.2)Y = 150 ==> Y = 5*150 = 750.1.b.Since TA = TR = 0, it follows that S = YD - C = Y - C. ThereforeS = Y - [100 + (0.8)Y] = - 100 + (0.2)Y ==> S = - 100 + (0.2)750 = - 100 + 150 = 50.As we can see S = I, which means that the equilibrium condition is fulfilled.1.c.If the level of output is Y = 800, then AD = 150 + (0.8)800 = 150 + 640 = 790.Therefore the amount of involuntary inventory accumulation is UI = Y - AD = 800 - 790 =10.1.d. AD' = C + I' = 100 + (0.8)Y + 100 = 200 + (0.8)YFrom Y = AD' ==> Y = 200 + (0.8)Y ==> (0.2)Y = 200 ==> Y = 5*200 = 1,000Note: This result can also be achieved by using the multiplier formula:∆Y = (multiplier)(∆Sp) = (multiplier)(∆I) ==> ∆Y = 5*50 = 250,that is, output increases from Y o = 750 to Y1 = 1,000.1.e.From 1.a. and 1.d. we can see that the multiplier is α = 5.2.a.Since the mpc has increased from 0.8 to 0.9, the size of the multiplier is now larger. Therefore weshould expect a higher equilibrium income level than in 1.a.AD = C + I = 100 + (0.9)Y + 50 = 150 + (0.9)Y ==>Y = AD ==> Y = 150 + (0.9)Y ==> (0.1)Y = 150 ==> Y = 10*150 = 1,500.2.b.From ∆Y = (multiplier)(∆I) = 10*50 = 500 ==> Y1 = Y o + ∆Y = 1,500 + 500 = 2,000.2.c.Since the size of the multiplier has doubled from α = 5 to α1 = 10, the change in output (Y) that resultsfrom a change in investment (I) now has also doubled from 250 to 500.3.a. AD = C + I + G + NX = 50 + (0.8)YD + 70 + 200 + 0 =320 + (0.8)[Y - TA + TR]= 320 + (0.8)[Y - (0.2)Y + 100] = 400 + (0.8)(0.8)Y = 400 + (0.64)YFrom Y = AD ==> Y = 400 + (0.64)Y ==> (0.36)Y = 400279==> Y = (1/0.36)400 = (2.78)400 = 1,111.11The size of the multiplier is α = 1/0.36) = 2.78.3.b.BS = tY - TR - G = (0.2)(1,111.11) - 100 - 200 = 222.22 - 300 = - 77.783.c.AD' = 320 + (0.8)[Y - (0.25)Y + 100] = 400 + (0.8)(0.75)Y = 400 + (0.6)YFrom Y = AD' ==> Y = 400 + (0.6)Y ==> (0.4)Y = 400 ==> Y = (2.5)400 = 1,000The size of the multiplier is now reduced to α1 = (1/0.4) = 2.5.3.d.The size of the multiplier and equilibrium output will both increase with an increase in the marginalpropensity to consume. Therefore income tax revenue will also go up and the budget surplus should increase. This can be seen as follows:BS' = (0.25)(1,000) - 100 - 200 = - 50 ==> BS' - BS = - 50 - (-77.78) = + 27.783.e.If the income tax rate is t = 1, then all income is taxed. There is no induced spending and equilibriumincome always increases by exactly the change in autonomous spending. In other words, the size of the expenditure multiplier is 1.From Y = C + I + G ==> Y = C o + c(Y - TA + TR) + I o + G o = C o + c(Y - 1Y + TR o) + I o + G o ==> Y = C o + cTR o + I o + G o = A o==> ∆Y = ∆A o4.On first sight, one may want to conclude that this is an application of the balanced budget theorem,since, as long as Y = 1,000, a change in the tax rate by 5% will cause total tax revenues to change by ∆TA = 50, which is the same as the change in government purchases, that is, ∆G = 50. As long as income (Y) stays the same, the budget surplus will not be affected. However, this combined fiscal policy change will have an effect on national income and, since national income goes up, so does the government’s tax revenue, due to the fact that we have income taxation. Therefore we should expect an increase in the budget surplus. This can easily be shown with a numerical example.For example, in Problem 3.d. we had a situation where the following was given:Y o = 1,000, t o = 0.25, G o = 200 and BS o = - 50.Assume now that t1 = 0.3 and G1 = 250 ==>AD' = 50 + (0.8)[Y - (0.3)Y + 100] + 70 + 250 = 370 + (0.8)(0.7)Y + 80 = 450 + (0.56)Y.From Y = AD' ==> Y = 450 + (0.56)Y ==> (0.44)Y = 450==> Y = (1/0.44)450 = 1,022.73280BS1 = (0.3)(1,022.73) - 100 - 250 = 306.82 - 350 = - 43.18 == > BS1– BS o = -43.18 - (-50) = + 6.82Therefore we see that the budget surplus has increased, since the increase in income tax revenue is larger than the increase in government purchases.5.a.While an increase in government purchases by ∆G = 10 will change intended spending by ∆Sp = 10,a decrease in government transfers by ∆TR = -10 will change intended spending by a smaller amount,that is, by only ∆Sp = c(∆TR) = c(-10). The change in intended spending equals ∆Sp = (1 - c)(10) and equilibrium income should therefore increase by∆Y = (multiplier)(1 - c)10.5.b.If c = 0.8 and t = 0.25, then the size of the multiplier isα = 1/[1 - c(1 - t)] = 1/[1 - (0.8)(1 - 0.25)] = 1/[1 - (0.6)] = 1/(0.4) = 2.5.The change in equilibrium income is∆Y = α(∆A o) = α[∆G + c(∆TR)] = (2.5)[10 + (0.8)(-10)] = (2.5)2 = 55.c.The budget surplus should increase, since the level of equilibrium income has increased and thereforethe level of tax revenues has increased, while the changes in government purchases and transfer payments cancel each other out. Numerically, this can be shown as follows:∆BS = t(∆Y) - ∆TR - ∆G = (0.25)(5) - (-10) - 10 = 1.25Chapter 10Money, interest, fiscal policy1.a. Each point on the IS-curve represents an equilibrium in the expenditure sector. (Note that this is aclosed economy, that is, NX = 0).The IS-curve can be derived by setting actual income equal to intended spending, orY = C + I + G = (0.8)[1 - (0.25)]Y + 900 - 50i + 800 = 1,700 + (0.6)Y - 50i ==>(0.4)Y = 1,700 - 50i ==> Y = (2.5)(1,700 - 50i) ==> Y = 4,250 - 125i.1.b.The IS-curve shows all combinations of the interest rate and output level such that the expendituresector (the goods market) is in equilibrium, that is, actual output equals intended spending. A decrease in the interest rate stimulates investment spending, making intended spending greater than actual output. The resulting unintended inventory decrease leads firms to increase their production until actual output is again equal to intended spending. This means that the IS-curve is downward sloping.1.c.Each point on the LM-curve represents an equilibrium in the money sector. Therefore the LM-curvecan be derived by setting real money supply equal to real money demand, that is,281M/P = L ==> 500 = (0.25)Y - 62.5i ==> Y = 4(500 + 62.5i) ==> Y = 2,000 + 250i.1.d.The LM-curve shows all combinations of the interest rate and level of output such that the moneysector is in equilibrium, that is, the demand for real money balances is equal to the supply of real money balances. An increase in income will increase the demand for real money balances. Given a fixed real money supply, this will lead to an increase in interest rates, which will then reduce the quantity of real money balances demanded until the money market clears again. In other words, the LM-curve is upward sloping.1.e.The level of income (Y) and the interest rate (i) at the equilibrium are determined by the intersectionof the IS-curve with the LM-curve. At this point, the expenditure sector and the money sector are both in equilibrium simultaneously.From IS = LM ==> 4,250 - 125i = 2,000 + 250i ==> 2,250 = 375i ==> i = 6==> Y = 4,250 - 125*6 = 4,250 - 750 ==> Y = 3,500Check: Y = 2,000 + 250*6 = 2,000 + 1,500 = 3,500i125 ISLM62,000 3,500 4,250 Y2.a.As we have seen in 1.a., the value of the expenditure multiplier is α = 2.5. This multiplier is derivedin the same way as in Chapter 9. But now intended spending also depends on the interest rate, so we no longer have Y = αA o, but ratherY = α(A o - bi) = (1/[1 - c + ct])(A o - bi) ==> Y = (2.5)(1,700 - 50i) = 4,250 - 125i.2.b.In the IS-LM model, an increase in government purchases (G) will have a smaller effect on outputthan in the model of the expenditure sector used in Chapter 9, in which interest rates are assumed to be fixed. This can be answered most easily with a numerical example. Assume that government purchases increase by ∆G = 300. The IS-curve shifts parallel to the right by==> ∆IS = (2.5)(300) = 750.Therefore, the equation of the new IS-curve is: Y = 5,000 - 125i.282。

多恩布什 宏观经济学 课后答案01

多恩布什 宏观经济学 课后答案01

Problems1. "A country's rate of economic growth is determined solely by the amount ofresources available to the country." Comment on this statement.Increases in the availability of resources, that is, labor and capital used in the production of goods and services account for only part of a nation's economic growth. The efficiency with which these factors of production are used also affects economic growth. Increases in the efficiency of production result from increases in the education and skill levels of the labor force and from newer and more efficient technology. In addition, the factors of production are not fully employed all the time. During an expansion or recovery, the use of the factors of production increases, which leads to an increase in production and output.2. In the 1960s, increases in the rate of unemployment were generally associatedwith decreases in the inflation rate and vice versa. But in the 1970s and 1980s unemployment and inflation often moved in the same direction. How can you explain this?A shift in aggregate demand causes the unemployment rate and the inflation rate to move inopposite directions, whereas a shift in aggregate supply causes unemployment and inflation to move in the same direction. Most disturbances in the 1960s came from the demand side, while many of the disturbances in the 1970s and 1980s came from the supply side.3. "Since the long-run AS-curve is vertical, we can conclude that the total real outputof a nation cannot grow in the long run." Comment on this statement.The AD-AS framework is a static framework that assumes that the level of potential GDP is fixed. However, the potential GDP of a nation grows over time as the amount of available resources or the efficiency with which these resources are used increases. Figure 1-4 in the text clearly indicates that the long-run (vertical) AS-curve moves to the right by a small percentage each year.4. "Long-run growth can best be studied by focussing on the reasons for businesscycles." Comment on this statement.Growth theory focuses primarily on the accumulation of inputs and improvements in technology that allow for an increased standard of living over time.Since growth theory tries to explain the average growth rate of an economy over many years, it ignores the short-run fluctuations (recessions and booms) that occur over the course of business cycles.5. "In the very short run real output is fixed and therefore any increase in aggregatedemand will simply increase the price level but not affect how many goods andservices are produced in an economy." Comment on this statement.The short-run AS-curve is completely horizontal, based on the assumption that prices are constant. An increase in aggregate demand will therefore increase the level of output but will not affect the price level. It follows therefore that in the short run the level of output is solely determined by aggregate demand.6. "There is always a clear tradeoff between unemployment and inflation." Comment.The short-run Phillips curve describes an empirical relationship between wage and price inflation and the rate of unemployment. This curve shows that the higher the rate of unemployment, the lower the rate of inflation and vice versa (at least in the short run). However, in the long run there is no clear-cut tradeoff between inflation and unemployment. The economic events of the 1970s and 1980s showed us that unemployment and inflation can increase or decrease simultaneously.7. The index of leading economic indicators is supposed to signal future developmentsin the economy and is calculated from variables in different sectors of the economy.Pick one leading economic indicator from each of the following sectors and briefly state the rationale for including this indicator in the calculation of the index:(1) the labor sector, (2) business activity, (3) the financial sector, and (4) residentialconstruction.The answer to this question is student specific. Here is a sample answer.The labor sector:Employment figures as well as the unemployment rate should be used to look for changes in the labor sector. The unemployment rate is more often discussed in the media, but the employment figures have smaller cyclical variations and are thus a better indicator of labor market conditions.Business activity:New orders, changes in inventories, capacity utilization, and industrial production are often used to interpret business activity. When using inventory changes it is important to distinguish between desired inventory changes, which may reflect changes in business expectations, and undesired inventory changes that reflect changes in the demand for the product.The financial sector:Stock market activity, changes in money supply, or credit conditions can be used to show trends in financial markets. While the relationship between changes in stock values and the economy is not as close as it used to be, a continued increase in stock prices generally reflects increased optimism about future economic conditions. It also means an increase in wealth for stockholders and easier access to funds for firms wishing to make new investments.Residential construction:A change in new building permits or housing starts may be the first sign of changing economic conditions. The housing sector is very sensitive to interest rate changes and tends to be indicative of other sectors of the economy, which often react in a similar way although to a lesser degree and with a time lag.8. Briefly discuss the usefulness of each of the following as leading economicindicators:(i) inventory changes, (ii) the GDP-deflator, (iii) the unemployment rate,(iv) the Dow Jones Industrial Average.Desired inventory changes reflect changes in business expectations and can be used as a leading economic indicator. But undesired inventory changes reflect changes in demand for the product and are therefore a lagging economic indicator. Only if one can separate out desired from undesired inventory changes, will it be possible to spot more clearly signs of an upcoming boom or recession.The GDP-deflator is the most complete price index, since it measures price changes of all final goods and services currently produced in a country. But the GDP-deflator is a lagging indicator, showing what has happened over the last quarter. In addition, initial GDP data tend to be fairly unreliable and have to be frequently revised.The unemployment rate has fairly small cyclical variations and is used as a measure for variations in the demand for labor. Changes in the unemployment rate also correspond well with changes in GDP. But the unemployment rate is a concurrent indicator.Changes in stock values generally reflect changes in expectations of financial investors about dividends. If stock values go up people may feel wealthier and thus consumer spending may increase. Firms may have an easier time issuing new stock and thus they may invest more. In this case, we can expect an economic upswing. However, changes in stock values often may simply be due to speculative behavior and may not be related to real economic activity.9. In each of the three pairs below, which variable would you choose (and why) as aleading economic indicator:(i) labor productivity or the unemployment rate(ii) the CPI or the PPI(iii) stock market changes or housing startsLabor productivity generally shows long run trends in the labor market and will determine wages and therefore living standards. It is a leading indicator, but cannot be easily used for forecasting.The unemployment rate has fairly small cyclical variations and is used as a measure for variations in the demand for labor. It is a very accurate measure of economic performance--at least as far as the labor sector is concerned. However, the unemployment rate is a concurrentand not a leading indicator.The CPI measures the price increase of a fixed market basket of 386 goods and services purchased by an average urban family. The CPI is easily available and is supposed to measure cost of living increases. However, the CPI is a concurrent indicator.The PPI measures average price changes of a market basket of over 1,000 intermediate goods up to the retail stage. It is relatively easily available and shows future price trends with relative accuracy. The PPI is a leading indicator and does not always correspond exactly with the CPI.Stock market changes reflect changes in expectations of financial investors about dividends arising from a perceived change in economic conditions. If stock values increase consumers may feel wealthier (and thus spend more), and firms have an easier time issuing new stock (and thus invest more). But while a change in stock values may indicate an upcoming change in economic conditions, it also could simply have been caused by speculative behavior. Thus, it is a leading indicator that is, however, not always reliable.The demand for housing is very interest sensitive, since mortgage interest payments are a large part housing costs. Housing starts tend to increase sharply when interest rates drop to low levels, that is, when the economy is at the bottom of a recession. A change in housing starts thus is often seen as a turning point in the economy, since other sectors in the economy are expected to react similarly to changes in interest rates but with a lag and to a lesser degree. The increase in construction work naturally also stimulates economic activity in other sectors of the economy. Thus housing starts is seen as a fairly reliable leading economic indicator.。

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Chapter 22. Assume a German tourist buys a Mexican beer in a pub in Houston, Texas. How will the U.S. GDP be affected? CA.U.S. GDP will be unaffected, since a foreigner buys a foreign product.B. U.S. GDP will decrease since the beer has to be imported from MexicoC. U.S. GDP will increase by the value added at the Houston pubD. U.S. GDP will increase, but only by the sales tax assessed on the beer7. If nominal GDP is $10,406 billion and the GDP-deflator is 110, then real GDP is about $9,460 billion8. The GDP-deflator and the CPI differ from each other since CA. the GDP-deflator does not include services but the CPI doesB. the GDP-deflator includes imported goods but the CPI doesn'tC. the CPI measures a fixed market basket but the GDP-deflator doesn'tD. the CPI includes more goods than the GDP-deflator does9. Assume you desire a real rate of return of 4% on an investment and you expect the annual average inflation rate to be 3.2%. What should the nominal interest rate be on this investment? 7.2%Chapter 93. Assume a model with no government and no foreign sector. If the consumption function is defined as C = 800 + (0.8)Y, and the income level is Y = 2,000, then the level of total saving is -4004. Assume a model with no government and no foreign sector. If we have a savings function that is defined as S = - 200 + (0.1)Y and autonomous investment decreases by 50, by how much will consumption change? -4505. Assume a model without income taxation and no foreign sector. If government purchases are increased by $25 billion financed by a lump sum tax increase of $25 billion, then AA. national income will increase by $25 billion but the budget deficit is unaffectedB. national income will increase $50 billion but the budget deficit is unaffectedC. neither national income nor the budget deficit will be affectedD. we cannot say for sure what will happen to national income or the budget deficit6. The size of the expenditure multiplier increases with an increase in CA. government transfer paymentsB. the marginal propensity to saveC. marginal propensity to consumeD. the income tax rate7. Assume the savings function is S = - 200 + (1/4)YD and the marginal tax rate is t = 20%. If the level of government spending increases by 100, by how much will the level of equilibrium income change? 2508. Assume a model of the expenditure sector with income taxes. If the level of autonomous investment decreases (due to negative business expectations), which of the following will be true? DA. the actual budget surplus will not be affectedB. the actual budget surplus will increaseC. the structural budget surplus will decreaseD. the cyclical component of the budget surplus will decrease9. Assume the consumption function is C = 600 + (3/4)YD and the income tax rate is t = 20%. What will be the effect on the actual budget surplus of an increase in autonomous investment by 200? an increase by 10010. Assume the consumption function is C = 200 + (0.8)YD and the income tax rate is t = 0.25. What will be the eff ect of an increase in government transfers by ΔTR = 100 on the full-employment budget surplus? an decrease by 100Chapter 104.哪些政策会使IS曲线变陡峭并向左移动?DA.货币供应量的减少B.政府转移支付的减少C.一笔税收的减少D.所得税率的减少5.LM曲线左上方表示DA.商品和服务的过度需求B.商品和服务的过度供给C.货币的过度需求D.货币的过度供给6.LM曲线会在什么情况下变平坦?BA.货币需求对利率变化的敏感度低B.货币需求对收入变化敏感度低C.货币需求对收入变化敏感度高D.货币政策乘数变大7.在IS-LM模型中,如果自主储蓄增加会导致收入和利率均减少8. 在IS-LM框架下,扩张性货币政策会增加消费和投资9.沿着AD曲线从左向右运动相当于BA.由于利率下降,IS右移B.由于实际货币余额增加,LM右移C.由于增加名义货币供给量,LM右移D.由于较低的实际货币余额,沿着LM曲线从左向右移动10.什么情况下AD曲线右移 AA.政府转移支付增加B.由于价格水平下降,实际货币余额增加C.自主储蓄增加D.央行限制名义货币供给量Chapter 111. 在美国,扩张性货币政策常以下方式进行:C A.财政部发行新债券来融资增加预算赤字B. 美联储要求银行增加贷款活动C. 美联储从银行或政府安全经销商那购买债券,以换取金钱D.美联储乡政府出售债券4.扩张性财政政策的副作用利率上升会导致国内生产总值的组成发生变化5.如果央行固定汇率BA.每次财政扩张后要承担公开市场销售B.每次IS曲线变动时,央行都要调整货币供给C.财政政策变化不会影响消费和投资D.上述所有6.挤出指的是CA.当所得税提高时,消费水平降低B.投资补贴减少后,投资水平降低C.财政政策的变化通过改变利率影响GDP的构成D.流动性陷阱时,财政政策完全无效8. 如果政府通过投资补贴刺激经济,BA. 投资和产出水平会增加,但消费将不受影响B. 投资增长的一部分会通过提高利率来抵消C. 可避免增加利率D. 央行的帮助下仍然必要的,因为补贴不会使利率上升10. 如果央行拒绝大量增加政府支出,最可能的结果将是A.由于利率改变,国际收支的经常账户出现盈余B.由于利率改变,消费水平下降C.GDP组成发生变化D.上述所有Chapter 122. Which of the following items is a surplus item in the balance of payments for the United Sates?A. a U.S. car dealer buys 20 BMWs from Germany and sells them at a profit in the U.S.B. a U.S. citizen deposits funds in a bank in the BahamasC. a German firm pays to get a license for the use of American technologyD. Bill Gates buys himself a small island off the coast of Indonesia4. 如果美国商品的价格水平为P = 110,外国商品的价格水平为P f = 220,名义汇率为e=1.2,真正汇率为 2.46. The concept of relative purchasing power parity implies thatA. the real exchange rate adjusts slowly to its long-run average levelB. the domestic price level will change rapidly until the real exchange rate is equal to 1C. the relative demand for domestic goods will rise if the real exchange rate is below 1D. the long-run relative price level of domestic to foreign goods (P/P f) is equal to 17. Restrictive monetary policy in the U.S.A. lowers the value of the U.S. dollar relative to other currenciesB. increases the value of the U.S. dollar relative to other currenciesC. increases U.S. net exportsD. should not have any effect on the U.S. trade balance9. In a model with flexible exchange rates and perfect capital mobility, restrictive fiscal policy is likely to causeA. an appreciation of the domestic currencyB. a decrease in the current account surplusC. an increase in net exportsD. an inflow of funds10. A country that follows a beggar-thy-neighbor policyA. induces an exchange rate depreciation to increase domestic output via monetary policyB. uses fiscal policy to increase its competitiveness on world marketsC. imposes a tariff on imported goodsD. tries to benefit from an increase in world demand by selling domestic products at higher pricesChapter 52.The Keynesian AS-curve implies thatA) the economy is always at the full-employment level of outputB) the AS-curve is completely verticalC) wages and prices are completely flexibleD) a change in spending will affect the level of GDP but not the price level3 In the Keynesian AS-curve case, if the government cuts welfare payments, thenA) the price level will decrease, but the economy will remain at the full-employment level of outputB) the level of output will decrease but the price level will remain the sameC) the levels of output and prices will decreaseD) unemployment will increase, since wages and prices are completely flexible4.The slope of the AS-curve becomes steeperA) as wages and prices become more flexibleB) as wages become more rigidC) as the economy moves further away from full employmentD) as the government implements expansionary fiscal policy5.If the unemployment rate is assumed to be at its natural rate, thenA) inflation cannot existB) the unemployment rate is zeroC) the unemployment rate is positive but at a level that exists when GDP is at its potential levelD) all unemployment is cyclical in nature6.In the medium run, an increase in oil prices willA) increase the price level but reduce the level of outputB) lead to a decrease in aggregate demandC) lead to an increase in aggregate demandD) not affect the level of real output10.As potential GDP grows over timeA) the level of output is essentially determined by shifts in the vertical AS-curveB) the price level remains constantC) the AD-curve shifts to the right due to a change in the average price levelD) the level of actual output can only change if the AD-curve shifts accordinglyChapter 65.The coordination approach to the Phillips curve focuses on the fact thatA) fiscal and monetary policies often are uncoordinatedB) firms are reluctant to change wages and prices because they aren't sure what their competitors will doC) workers are well informed about changes in their nominal wages but not about changes in their real wagesD) anticipated changes in monetary policy have no significant effect on the unemployment rate7.Which of the following equations best describes Okun's law?A) (Y - Y*) = 0.5(u - u*)B) (Y - Y*)/ Y* = - 2(u - u*)C) (Y* - Y) = 2(u - u*)D) (Y* - Y)/Y = - 0.5(u - u*)9.Which of the following is the most likely result of an unanticipated increase in money supply?A) higher prices and output in the medium run but no change in output in the long runB) higher prices and lower real money balances in both the medium and the long runC) higher prices and employment in the medium run, but no change in output and prices in the long runD) higher prices and output in the medium and long runs10.If the government employs restrictive monetary policy in response to an adverse supply shock,A) the inflation rate and the natural rate of unemployment will both decreaseB) the rate of unemployment will increase sharplyC) unemployment will remain at its natural levelD) the shift in the AS-curve can be reversed almost immediatelyChapter 33.If we assume a Cobb-Douglas production function where the share of labor is 3/4 and the share of capital is 1/4, then the marginal product of capital can be calculated asA) 3Y/4KB) Y/4KC) 4Y/KD) Y/K5.Assume a Cobb-Douglas aggregate production function in which labor's share of income is 0.7 and capital's share of income is 0.3. At what rate will real output grow if labor grows at2.0%, the capital stock grows at 1.0%, and total factor productivity increases by 1.8%?A) 4.8%B) 3.5%C) 3.0%D) 1.8%6.In the neoclassical growth model, a decrease in the savings rateA) raises the growth rate of output per capitaB) lowers the growth rate of output per capitaC) raises the steady-state capital-labor ratioD) lowers the steady-state capital-labor ratio7.In the neoclassical growth model, a decrease in the rate of population growth willA) decrease the growth rate of outputB) decrease the level of output per capitaC) decrease the steady-state capital-labor ratioD) all of the above8.In the neoclassical growth model, a one-time increase in technology willA) increase the growth rate of outputB) shift the investment requirement line upC) increase the steady-state capital-labor ratioD) all of the aboveChapter 41.Constant returns to scale for capital alone implies thatA) as both capital inputs and labor inputs are doubled, output will more than doubleB) as both capital inputs and labor inputs are doubled, output will less than doubleC) as both capital inputs and labor inputs are doubled, output will doubleD) as capital inputs are doubled, output will less than double2.Paul Romer's notion of social returns to capital implies thatA) the contribution of any new knowledge will not just go to the producer of new knowledge but be shared by others as wellB) new capital investments have a bigger impact on growth if the owners of capital share their newfound wealth with the poorC) investment in real capital benefits society as a whole while investment in human capital only benefits those who invest in themselvesD) investment in real capital has a bigger impact on labor productivity than investment in human capital3.The distinction between private and social returns to capital is important sinceA) policy makers want to know how much the government can gain from capital investmentsB) capital investments cannot be undertaken profitably unless subsidized by the governmentC) capital investments often have important spillover effectsD) capital investment increases labor productivity4.Assume an endogenous growth model with labor augmenting technology and a production function of the form Y = F(K,AN), with A = 2(K/N) such that y = 2k. If the rate of population growth is n = 0.03, the rate of depreciation is d = 0.04, and the savings rate is s = 0.08, the growth rate of output per capita isA) 15%B) 9%C) 7%D) 1%5.Assume an endogenous growth model with labor augmenting technology and a production function of the form Y = F(K,AN), with A = 1.2(K/N) such that y = 1.2k. If the rate of population growth is n = 0.03, the rate of depreciation is d = 0.05, how large would the savings rate (s) have to be to achieve a per-capita growth rate of output of 4 percent?A) 12%B) 10%C) 8%D) 4%6.Assume an aggregate production function with a constant marginal product of capital and with capital as the only factor of production, such that Y = aK. If there is neither population growth nor depreciation of capital, the growth rate of per-capita output isA) Δy/y = saB) Δy/y = sa + (n - d)C) Δy/y = sa + (n + d)D) Δy/y = sa/(n + d)7.The idea that increased investment in research and development will enhance economic growth isA) the key to linking higher savings rates to higher equilibrium growth ratesB) totally unprovenC) a crucial element of conditional convergenceD) an important part of the neoclassical growth model8.Conditional convergence is predicted for two countries with the same population growth and access to the same technology. This means that they will eventuallyA) reach the same income per capita and the same economic growth rate even if they have different savings ratesB) reach a different income per capita but the same economic growth rate even if they have different savings ratesC) reach the same income per capita and different economic growth rates if they have different savings ratesD) reach different income per capita levels and different economic growth rates if they have different savings rates9.Endogenous growth theory predicts that countries will achieve higher economic growth rates if they manage toA) lower their population growthB) increase their savings ratesC) shield their industries from foreign competitionD) all of the above10.The four "Asian Tigers" achieved their economic growth between 1966 and 1990 mostly throughA) population controlB) protection of domestic industries from foreign competitionC) hard work and sacrificeD) a large degree of government interventionChapter 131.Keynes' theory of consumption behavior largely relied on the equation C = Co + cY. This equation implies that the value of the average propensity to consumeA) increases as the economy goes into a recessionB) increases as the economy goes into a boomC) remains constant whether the economy goes into a boom or a recessionD) is always lower than the value of the marginal propensity to consume2.Assume a worker at age 30 with no wealth and an expected average annual earnings of $50,000, who wants to retire at age 65 and expects to live until age 80. According to the life-cycle hypothesis what dollar amount does that person consume annually?A) $45,000B) $40,000C) $35,000D) $30,0003.If we divide consumption expenditures into the purchases of non-durable goods and the purchases of durable goods, we realize thatA) the life-cycle and permanent-income theories apply much more to the consumption of non-durable goods than durable goodsB) the consumption of non-durable goods is much more interest sensitive than the consumption of durable goodsC) the consumption of non-durable goods is more strongly affected by a surprise change in income than the consumption of durable goodsD) the consumption of durable goods this year is largely the same as the consumption of durable goods last year4.According to the permanent-income theory of consumptionA) the short-run multiplier is identical to the long-run multiplierB) the short-run multiplier is larger than the long-run multiplierC) the short-run mpc is larger than the long-run mpcD) the short-run mpc is smaller than the long-run mpc5.According to the permanent-income hypothesisA) increases in current income lead to large increases in current consumptionB) current consumption is not significantly affected by a temporary change in incomeC) the mpc out of transitory income is greater than the mpc out of permanent incomeD) increases in the interest rate will affect consumption negatively6.The random-walk theory of consumptionA) clearly contradicts the permanent-income theoryB) predicts that current consumption is most strongly affected by current incomeC) predicts that this year's consumption is most strongly affected by last year's consumptionD) does not support the notion that people have rational expectations7.The fact that consumption exhibits "excess smoothness" implies thatA) consumption responds too strongly to surprise changes in incomeB) current consumption can be predicted based on changes in current incomeC) changes in transitory income have no effect on current consumption or savingD) none of the above8.If we account for liquidity constraints,A) we can explain why a temporary tax increase may have an effect on current consumptionB) we have to discard the permanent-income hypothesisC) consumption becomes much more interest sensitiveD) consumption responds much less severely to surprise changes in income9.Household savings behavior tends to be fairly interest inelastic, which can be largely explained byA) a very large substitution effectB) the fact that the income effect dominates the substitution effectC) the fact that the substitution effect is largely offset by the income effectD) the fact that the consumption of durable goods tends to be very interest inelastic10.Which of the following is an objection to the Barro-Ricardo proposition?A) people believe that debt-financing merely postpones taxationB) people who benefit from a tax cut now are often not the same people who pay higher taxes laterC) a tax cut may ease a person's liquidity constraints, inducing the person to consume moreD) most people can borrow funds when necessary and therefore always consume according to their permanent incomeChapter 141Which of the following will NOT affect the productive capacity of a country?A) more people getting a higher educationB) more people investing in government bondsC) the government improving the infrastructure such as bridges and highwaysD) firms replacing old PCs with newer, more efficient ones2In absence of taxation, the rental cost of capital can be defined asA) rc = i + πe - dB) rc = i - πe - dC) rc = i - πe + dD) rc = i + πe + d3If we ignore taxation and know that the rental cost of capital is 12%, the expected rate of inflation is 4%, and the nominal interest rate is 9%, we can conclude that the rate of depreciation must beA) d = 1%B) d = 7%C) d = 17%D) d = 25%4If the rental cost of capital is above the marginal product of capital, then a firm shouldA) increase its investment spendingB) decrease its investment spendingC) not replace some of the machines that have broken down in the production processD) undertake primarily replacement investments5Assume a Cobb-Douglas production function of the form Y = AK0.2N0.8. If the rental cost of capital is rc = 5%, the desired capital stock of a cost-minimizing firm should be equal toA) K* = 2YB) K* = 4YC) K* = 5YD) K* = 8Y6Assume the market interest rate is 10% and is not expected to change over the next three years. If an investment project has net returns of $2,420 after one year, $3,630 after the second year, and $3,993 after the third year, what is its net present discounted value?A) $10,043B) $9,130C) $9,020D) $8,2007The most likely source of funding for a U.S. firm wishing to finance a new investment project isA) a credit line with a bankB) retained earningsC) selling bondsD) issuing equity (stocks)8According to the accelerator model,A) a change in investment is proportional to the level of outputB) the level of investment spending is proportional to the level of outputC) the level of investment spending is proportional to the change in outputD) the level of investment spending is mainly affected by interest rate changes9Expansionary monetary policy has an effect on the housing market since itA) decreases the price of all assets, including housing pricesB) lowers real interest rates in the long run, so people will postpone buying homesC) lowers nominal interest rates, so banks find mortgage lending less profitableD) lowers nominal interest rates, so more homebuyers are able to qualify for mortgages10An unanticipated decrease in the level of inventories may occurA) in the midst of a boom, as firms prepare for the upcoming recessionB) in a boom when increased sales cannot be met by increases in productionC) in a recession when firms expect lower profits and try to keep their costs lowD) at the beginning of a recession as firms slash their prices to induce more salesChapter 151.As credit and debit cards are more widely used, we should expect thatA) more money balances will be held in M1B) more money balances will be held in M2C) less money balances will be held in M2D) less money balances will be held in M1, but those held in M2 will remain unchanged 2Which of the following would lead to increased money balances in M1?A) more purchases made on the internetB) more credit card purchasesC) lower inflationary expectationsD) all of the above3A financial asset is considered less liquid ifA) it has a longer maturityB) it is issued by the government rather than a large corporation such as MicrosoftC) it earns a lower yieldD) none of the above4The Baumol-Tobin square-root formula for money demand applies primarily toA) the transactions motive of holding moneyB) the precautionary motive of holding moneyC) the speculative motive of holding moneyD) the store-of-value motive of holding money5According to the Baumol-Tobin square-root formula, the amount of money balances held for transaction willA) increase as interest rates increaseB) decrease as the cost of money transactions increasesC) increase less than proportionately to increases in incomeD) all of the above6The speculative demand for moneyA) will always increase proportionately to the precautionary demand for moneyB) will always increase proportionately to the transactions demand for moneyC) is affected by changes in bond yields but not equity yieldsD) cannot be easily separated from money demand for transaction or precaution7If the expected growth rate in real GDP for next year is 2.5%, we can anticipate that the demand for M1 money holdings willA) also increase by 2.5%B) increase by more than 2.5%C) increase by less than 2.5%D) remain constant8The income velocity of money is defined asA) real money supply divided by real GDPB) nominal money supply divided by nominal GDPC) nominal GDP divided by nominal money supplyD) national income divided by the currency outstanding9If the government increases the level of government purchases, we can expect thatA) interest rates and the income velocity of money will both increaseB) interest rates and the income velocity of money will both decreaseC) interest rates will increase but the income velocity of money will decreaseD) interest rates will increase but the income velocity of money will remain the same 10According to the quantity theory of money, in the long runA) the behavior of velocity is hard to predictB) a change in money supply will be followed by a proportional change in the price levelC) an increase in nominal money supply will result in a proportional decrease in velocityD) an increase in nominal money supply will result in a proportional increase in velocity。

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