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经济学原理课后题答案.doc

1、Chapter 1/Ten Principles of Economics F 13Chapter 11Ten Principles of Economics TEN PRINCIPLES OF ECONOMICSWHATS NEW:The discussions of Principle #4, “People respond to incentives,” Principle #7, “Governments can sometimes improve market outcomes,” and Principle #10, “Society faces a short-run trade

2、off between inflation and unemployment” have been shortened. A definition for the term “business cycle” has been added. A new FYI box on “How to Read This Book” has been added and provides students with tips on studying.LEARNING OBJECTIVES:By the end of this chapter, students should understand: that

3、 economics is about the allocation of scarce resources. that individuals face tradeoffs. the meaning of opportunity cost. how to use marginal reasoning when making decisions. how incentives affect peoples behavior. why trade among people or nations can be good for everyone. why markets are a good, b

4、ut not perfect, way to allocate resources. what determines some trends in the overall economy.CONTEXT AND PURPOSE:Chapter 1 is the first chapter in a three-chapter section that serves as the introduction to the text. Chapter 1 introduces ten fundamental principles on which the study of economics is

5、based. In a broad sense, the rest of the text is an elaboration on these ten principles. Chapter 2 will develop how economists approach problems while Chapter 3 will explain how individuals and countries gain from trade.The purpose of Chapter 1 is to lay out ten economic principles that will serve a

6、s building blocks for the rest of the text. The ten principles can be grouped into three categories: how people make decisions, how people interact, and how the economy works as a whole. Throughout the text, references will be made repeatedly to these ten principles.KEY POINTS:1. The fundamental les

7、sons about individual decisionmaking are that people face tradeoffs among alternative goals, that the cost of any action is measured in terms of forgone opportunities, that rational people make decisions by comparing marginal costs and marginal benefits, and that people change their behavior in resp

8、onse to the incentives they face.2. The fundamental lessons about interactions among people are that trade can be mutually beneficial, that markets are usually a good way of coordinating trades among people, and that the government can potentially improve market outcomes if there is some sort of mar

9、ket failure or if the market outcome is inequitable.3. The fundamental lessons about the economy as a whole are that productivity is the ultimate source of living standards, that money growth is the ultimate source of inflation, and that society faces a short-run tradeoff between inflation and unemp

10、loyment.CHAPTER OUTLINE:I.IntroductionBegin by pointing out that economics is a subject that students must confront in their everyday lives. Point out that they already spend a great deal of their time thinking about economic issues: prices, buying decisions, use of their time, etc.A.The word “econo

11、my” comes from the Greek word meaning “one who manages a household.”B.This makes some sense since in the economy we are faced with many decisions (just as a household is).C.Fundamental economic problem: resources are scarce.You will want to start the semester by explaining to students that part of l

12、earning economics is understanding a new vocabulary. Economists generally use very precise (and sometimes different) definitions for words that are commonly used outside of the economics discipline. Therefore, it will be helpful to students if you follow the definitions provided in the text as much

13、as possible.D.Definition of scarcity: the limited nature of societys resources.E.Definition of economics: the study of how society manages its scarce resources.Because most college freshmen and sophomores have limited experiences with viewing the world from a cause-and-effect perspective, do not und

14、erestimate how challenging these principles will be for the student.As you discuss the ten principles, make sure that students realize that it is okay if they do not grasp each of the concepts completely or find each of the arguments fully convincing. These ideas will be explored more completely thr

15、oughout the text.II.How People Make DecisionsTable 1A.Principle #1: People Face Tradeoffs1.“There is no such thing as a free lunch.” Making decisions requires trading off one goal for another.2.Examples include how a student spends her time, how a family decides to spend its income, how the U.S. gov

16、ernment spends tax dollars, how regulations may protect the environment at a cost to firm owners.3.A special example of a tradeoff is the tradeoff between efficiency and equity.a.Definition of efficiency: the property of society getting the most it can from its scarce resources.b.Definition of equit

17、y: the property of distributing economic prosperity fairly among the members of society.c.For example, tax dollars paid by wealthy Americans and then distributed to those less fortunate may improve equity but lower the return to hard work and therefore reduce the level of output produced by our reso

18、urces.d. This implies that the cost of this increased equity is a reduction in the efficient use of our resources.4.Recognizing that tradeoffs exist does not indicate what decisions should be made.B.Principle #2: The Cost of Something Is What You Give Up to Get It1.Making decisions requires individu

19、als to consider the benefits and costs of some action.2.What are the costs of going to college?a.We cannot count room and board (at least all of the cost) because the person would have to pay for food and shelter even if he was not in school.b.We would want to count the value of the students time si

20、nce he could be working for pay instead of attending classes and studying.3.Definition of opportunity cost: whatever must be given up to obtain some item.One of the hardest ideas for students to grasp is that “free” things are not truly free. Thus, you will need to provide students with numerous exa

21、mples of such “free” things with hidden costs, especially the value of time.C.Principle #3: Rational People Think at the Margin1.Many decisions in life involve incremental decisions: Should I remain in school this semester? Should I take another course this semester? Should I study an additional hou

22、r for tomorrows exam? 2.Definition of marginal changes: small incremental adjustments to a plan of action.3.Example: You are trying to decide how many years you should stay in school. Comparing the lifestyle of an individual with a Ph.D. to that of an individual who has dropped out of grade school w

23、ould be inappropriate. You are likely deciding whether or not to remain in school for an additional year or two. Thus, you need to compare the additional benefits of another year in school (the marginal benefit) with the additional cost of staying in school for another year (the marginal cost).4.Ano

24、ther example: Suppose that flying a 200-seat plane across the country costs the airline $100,000, which means that the average cost of each seat is $500. Suppose that the plane is minutes from departure and a passenger is willing to pay $300 for a seat. Should the airline sell the seat for $300? In

25、this case, the marginal cost of an additional passenger is very small.D.Principle #4: People Respond to Incentives1.Because people make decisions by weighing costs and benefits, their decisions may change in response to changes in costs and benefits.a.When the price of a good rises, consumers will b

26、uy less of it because its cost has risen.b.When the price of a good rises, producers will allocate more resources to the production of the good because the benefit from producing the good has risen.2.Sometimes policymakers fail to understand how policies may alter incentives and behavior.3.Example:

27、Seat belt laws increase use of seat belts and lower the incentives of individuals to drive safely. This leads to an increase in the number of car accidents. This also leads to an increased risk for pedestrians.If you include any incentive-based criteria on your syllabus, discuss it now. For example,

28、 if you reward class attendance (or penalize students who do not attend class), explain to students how this change in the marginal benefit of attending class can be expected to alter their behavior.III.How People InteractA.Principle #5: Trade Can Make Everyone Better Off1.Trade is not like a sports

29、 competition where one side gains and the other side loses.2.Consider trade that takes place inside your home. Certainly the family is involved in trade with other families on a daily basis. Most families do not build their own homes, make their own clothes, or grow their own food.3.Just like famili

30、es benefit from trading with one another so do countries.4.This occurs because it allows for specialization in areas that countries (or families) can do best.Activity 1Getting Dressed in the Global EconomyType:In-class assignmentTopics:Specialization, interdependence, self-interest, consumer choice,

31、 international tradeMaterials needed:NoneTime:20 minutesClass limitations:Works in any class sizePurposeThe advantages of specialization and division of labor are very clear in this example. The worldwide links of the modern economy are also illustrated. We depend on thousands of people we dont know

32、, wont see, and dont think of in order to get dressed each morning. Self-interest follows naturally from interdependence. Wages, profits, and rents give people the incentive to perform these varied tasks. We depend on them to clothe us and they depend on our purchases for their incomes.InstructionsA

33、sk the class to answer the following questions. Give them time to write an answer to each question, then discuss their answers before moving on to the next question. The first question can be answered with a brief phrase. The second question is the core of theassignment and takes several minutes. As

34、k them to list as many categories of workers as possible. The third question introduces demand concepts; most of the determinants of demand can be introduced during this discussion. For the fourth question, ask the class to look at the country-of-origin tags sewn in their garments.1.Where did your c

35、lothes come from?2.Who worked to produce your clothes?3.What things do you consider when buying a garment?4.Where were your clothes produced (what countries)?Common Answers and Points for Discussion1.Where did your clothes come from?There are many possible ways to answer, but many students will say

36、“the mall” or another retail outlet. Some may say “a factory,” “a sweatshop,” or “a foreign country.”Mention the importance of markets here (this can be emphasized by asking “Is anyone wearing something made by themselves, a friend, or a relative?”) and discuss distribution versus production.2.Who w

37、orked to produce your clothes?There is no end to the possible answers; garment and textile workers are obvious but most students will also list workers dealing with raw materials, transportation, management, design or machinery. Some may think more broadly to investors, road crews, bankers, engineer

38、s, or accountants.3.What things do you consider when buying a garment?Most answers focus on preferences (fit, style, quality, color). Price is cited less frequently. Ask about the importance of price until someone volunteers that income is important. Prices of substitute goods should also be discuss

39、ed. Expectations of price changes may also be mentioned. Few students mention complementary goods and most students reject the idea of choosing a sweater to match a particular outfit.4.Where were your clothes produced (what country)?A large number of countries will be represented, even in small clas

40、ses. Students are usually surprised to find how many garments are domestically produced. Asia is always well represented. Latin American and European goods appear in smaller numbers. African products are conspicuously absent.This pattern shows the limits of simple explanations such as “cheap labor.”

41、 Briefly discuss the importance of comparative advantage and specialization.B.Principle #6: Markets Are Usually a Good Way to Organize Economic Activity1.Many countries that once had centrally planned economies have abandoned this system and are trying to develop market economies.2.Definition of mar

42、ket economy: an economy that allocates resources through the decentralized decisions of many firms and households as they interact in markets for goods and services.3.Market prices reflect both the value of a product to consumers and the cost of the resources used to produce it. Therefore, decisions

43、 to buy or produce goods and services are made based on the cost to society of providing them.Explain to students that when households and firms do what is best for themselves, they often end up doing what is best for society, as if guided by market forcesor an invisible hand. Spend some time and em

44、phasize the magic of the market. Use numerous examples to show students that the market most often allocates resources to their highest valued use.4.When a government interferes in a market and restricts price from adjusting decisions that households and firms make are not based on the proper inform

45、ation. Thus, these decisions may be inefficient.5.Centrally planned economies have failed because they did not allow the market to work.6.FYI: Adam Smith and the Invisible Handa.Adam Smiths 1776 work suggested that although individuals are motivated by self-interest, an invisible hand guides this se

46、lf- interest into promoting societys economic well-being.b.Smiths astute perceptions will be discussed more fully in the chapters to come.C.Principle #7: Governments Can Sometimes Improve Market Outcomes1.There are two broad reasons for the government to interfere with the economy: the promotion of

47、efficiency and equity.2.Government policy can be most useful when there is market failure.a.Definition of market failure: a situation in which a market left on its own fails to allocate resources efficiently.3.Examples of Market Failurea.Definition of externality: the impact of one persons actions on the well-being of a bystander.b.Definition of market power: the ability of a single economic actor (or small group of actors) to have a substantial influence on market pri

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