曼昆经济学原理英文版文案加习题答案25章.doc

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1、Chapter 12/Production and Growth21925PRODUCTION AND GROWTH WHATS NEW IN THE SEVENTH EDITION:There is a new In the News box on “Does Food Aid Help or Hurt?”LEARNING OBJECTIVES:By the end of this chapter, students should understand:how much economic growth differs around the world.why productivity is

2、the key determinant of a countrys standard of living.the factors that determine a countrys productivity.how a countrys policies influence its productivity growth.CONTEXT AND PURPOSE:Chapter 12 is the first chapter in a four-chapter sequence on the production of output in the long run. Chapter 12 add

3、resses the determinants of the level and growth rate of output. We find that capital and labor are among the primary determinants of output. In Chapter 13, we address how saving and investment in capital goods affect the production of output, and in Chapter 14, we learn about some of the tools peopl

4、e and firms use when choosing capital projects in which to invest. In Chapter 15, we address the market for labor.The purpose of Chapter 12 is to examine the long-run determinants of both the level and the growth rate of real GDP per person. Along the way, we will discover the factors that determine

5、 the productivity of workers and address what governments might do to improve the productivity of their citizens.KEY POINTS:Economic prosperity, as measured by GDP per person, varies substantially around the world. The average income in the worlds richest countries is more than ten times that in the

6、 worlds poorest countries. Because growth rates of real GDP also vary substantially, the relative positions of countries can change dramatically over time.The standard of living in an economy depends on the economys ability to produce goods and services. Productivity, in turn, depends on the amounts

7、 of physical capital, human capital, natural resources, and technological knowledge available to workers.Government policies can try to influence the economys growth rate in many ways: by encouraging saving and investment, encouraging investment from abroad, fostering education, promoting good healt

8、h, maintaining property rights and political stability, allowing free trade, and promoting the research and development of new technologies.The accumulation of capital is subject to diminishing returns: The more capital an economy has, the less additional output the economy gets from an extra unit o

9、f capital. As a result, while higher saving leads to higher growth for a period of time, growth eventually slows down as capital, productivity, and income rise. Also because of diminishing returns, the return to capital is especially high in poor countries. Other things equal, these countries can gr

10、ow faster because of the catch-up effect.Population growth has a variety of effects on economic growth. On the one hand, more rapid population growth may lower productivity by stretching the supply of natural resources and by reducing the amount of capital available for each worker. On the other han

11、d, a larger population may enhance the rate of technological progress because there are more scientists and engineers.CHAPTER OUTLINE:I.Economic Growth around the WorldTable 1A.Table 1 shows data on real GDP per person for 13 countries during different periods of time.1.The data reveal the fact that

12、 living standards vary a great deal between these countries.2.Growth rates are also reported in the table. Japan has had the largest growth rate over time, 2.65% per year (on average).Use Table 1 to make the point that a one-percentage point change in a countrys growth rate can make a significant di

13、fference over several generations. The powerful effects of compounding should be used to underscore the process of economic growth.3.Because of different growth rates, the ranking of countries by income per person changes over time.a.In the late 19th century, the United Kingdom was the richest count

14、ry in the world.b.Today, income per person is lower in the United Kingdom than in the United States (a former colony of the United Kingdom).B.FYI: Are You Richer Than the Richest American?1.According to the magazine American Heritage, the richest American of all time is John B. Rockefeller, whose we

15、alth today would be the equivalent of approximately $200 billion.2.Yet, because Rockefeller lived from 1839 to 1937, he did not get the chance to enjoy many of the conveniences we take for granted today such as television, air conditioning, and modern medicine.3.Thus, because of technological advanc

16、es, the average American today may enjoy a “richer” life than the richest American who lived a century ago.C.FYI: A Picture Is Worth a Thousand Statistics1.This box presents three photos showing a typical family in three countries the United Kingdom, Mexico, and Mali. Each family was photographed ou

17、tside their home, together with all of their material possessions.2.These photos demonstrate the vast difference in the standards of living in these countries.II. Productivity: Its Role and DeterminantsA.Why Productivity Is So Important1.Example: Robinson Crusoe a.Because he is stranded alone, he mu

18、st catch his own fish, grow his own vegetables, and make his own clothes.b.His standard of living depends on his ability to produce goods and services.2.Definition of productivity: the quantity of goods and services produced from each unit of labor input.3.Review of Principle #8: A Countrys Standard

19、 of Living Depends on Its Ability to Produce Goods and Services.B.How Productivity Is Determined1.Physical Capital per Workera.Definition of physical capital: the stock of equipment and structures used to produce goods and services.b.Example: Crusoe will catch more fish if he has more fishing poles.

20、2.Human Capital per Workera.Definition of human capital: the knowledge and skills that workers acquire through education, training, and experience.b.Example: Crusoe will catch more fish if he has been trained in the best fishing techniques or as he gains experience fishing.3.Natural Resources per Wo

21、rkera.Definition of natural resources: the inputs into production that are provided by nature, such as land, rivers, and mineral deposits.b.Example: Crusoe will have better luck catching fish if there is a plentiful supply around his island.4.Technological Knowledgea.Definition of technological know

22、ledge: societys understanding of the best ways to produce goods and services.b.Example: Crusoe will catch more fish if he has invented a better fishing lure.C.FYI: The Production Function1.A production function describes the relationship between the quantity of inputs used in production and the quan

23、tity of output from production.2.The production function generally is written like this:where Y = output, L = quantity of labor, K = quantity of physical capital, H = quantity of human capital, N = quantity of natural resources, A reflects the available production technology, and F () is a function

24、that shows how inputs are combined to produce output.3.Many production functions have a property called constant returns to scale.a.This property implies that as all inputs are doubled, output will exactly double.b.This implies that the following must be true:where x = 2 if inputs are doubled.c.This

25、 also means that if we want to examine output per worker we could set x = 1/L and we would get the following:This shows that output per worker depends on the amount of physical capital per worker (K /L), the amount of human capital per worker (H /L), and the amount of natural resources per worker (N

26、 /L).4.Case Study: Are Natural Resources a Limit to Growth? a.This section points out that as the population has grown over time, we have discovered ways to lower our use of natural resources. Thus, most economists are not worried about shortages of natural resources.III.Economic Growth and Public P

27、olicyStart out by asking students what factors they believe will lead to greater economic growth in the future.A.Saving and Investment1.Because capital is a produced factor of production, a society can change the amount of capital that it has.2.However, there is an opportunity cost of doing so; if r

28、esources are used to produce capital goods, fewer goods and services are produced for current consumption.B.Diminishing Returns and the Catch-Up Effect1.Definition of diminishing returns: the property whereby the benefit from an extra unit of an input declines as the quantity of the input increases.

29、Figure 1a.As the capital stock rises, the extra output produced from an additional unit of capital will fall.b.This can be seen in Figure 1, which shows how the amount of capital per worker determines the amount of output per worker, holding constant all other determinants of output.c.Thus, if worke

30、rs already have a large amount of capital to work with, giving them an additional unit of capital will not increase their productivity by much.d.In the long run, a higher saving rate leads to a higher level of productivity and income, but not to higher growth rates in these variables.2.An important

31、implication of diminishing returns is the catch-up effect.a.Definition of catch-up effect: the property whereby countries that start off poor tend to grow more rapidly than countries that start off rich.b.When workers have very little capital to begin with, an additional unit of capital will increas

32、e their productivity by a great deal.C.Investment from Abroad1.Saving by domestic residents is not the only way for a country to invest in new capital.2.Investment in the country by foreigners can also occur.a.Foreign direct investment occurs when a capital investment is owned and operated by a fore

33、ign entity.b.Foreign portfolio investment occurs when a capital investment is financed with foreign money but operated by domestic residents.3.Some of the benefits of foreign investment flow back to foreign owners. But the economy still experiences an increase in the capital stock, which leads to hi

34、gher productivity and higher wages.4.The World Bank is an organization that tries to encourage the flow of investment to poor countries.a.The World Bank obtains funds from developed countries such as the United States and makes loans to less-developed countries so that they can invest in roads, sewe

35、r systems, schools, and other types of capital.b.The World Bank also offers these countries advice on how best to use these funds.D.Education1.Investment in human capital also has an opportunity cost.a.When students are in class, they cannot be producing goods and services for consumption.b.In less-

36、developed countries, this opportunity cost is considered to be high; as a result, children often drop out of school at a young age.2.Because there are positive externalities in education, the effect of lower education on the economic growth rate of a country can be large.3.Many poor countries also f

37、ace a “brain drain”the best educated often leave to go to other countries where they can enjoy a higher standard of living.E.Health and Nutrition1.Human capital can also be used to describe another type of investment in people: expenditures that lead to a healthier population.2.Other things being eq

38、ual, healthier workers are more productive.3.Making the right investments in the health of the population is one way for a nation to increase productivity.F.Property Rights and Political Stability1.Protection of property rights and promotion of political stability are two other important ways that p

39、olicymakers can improve economic growth.2.There is little incentive to produce products if there is no guarantee that they cannot be taken. Contracts must also be enforced.3.Countries with questionable enforcement of property rights or an unstable political climate will also have difficulty in attra

40、cting foreign (or even domestic) investment.4.In the News: Does Food Aid Help or Hurt?a.Economic policies designed to improve productivity sometimes have adverse unintended effects.b.This article from The Wall Street Journal, Real Time Economics blog discusses economic research on the effects of foo

41、d aid to poor countries on armed conflict in a recipient country.G.Free Trade1.Some countries have tried to achieve faster economic growth by avoiding transacting with the rest of the world.2.However, trade allows a country to specialize in what it does best and thus consume beyond its production po

42、ssibilities.3.When a country trades wheat for steel, it is as well off as it would be if it had developed a new technology for turning wheat into steel.4.The amount a nation trades is determined not only by government policy but also by geography.a.Countries with good, natural seaports find trade ea

43、sier than countries without this resource.b.Countries with more than 80 percent of their population living within 100 kilometers of a coast have an average GDP per person that is four times as large as countries with less than 20 percent of their population living near a coast.H.Research and Develop

44、ment1.The primary reason why living standards have improved over time has been due to large increases in technological knowledge.2.Knowledge can be considered a public good.3.The U.S. government promotes the creation of new technological information by providing research grants and providing tax inc

45、entives for firms engaged in research.4.The patent system also encourages research by granting an inventor the exclusive right to produce the product for a specified number of years.I.Population Growth1.Stretching Natural Resourcesa.Thomas Malthus (an English minister and early economic thinker) arg

46、ued that an ever-increasing population meant that the world was doomed to live in poverty forever.b.However, he failed to understand that new ideas would be developed to increase the production of food and other goods, including pesticides, fertilizers, mechanized equipment, and new crop varieties.2

47、.Diluting the Capital Stocka.High population growth reduces GDP per worker because rapid growth in the number of workers forces the capital stock to be spread more thinly.b.Countries with a high population growth have large numbers of school-age children, placing a burden on the education system.3.Some countries have already instituted measures to reduce population growth rates.4.Policies that foster equal treatment for women should raise economic opportunities for women leading to