INSTRUCTOR’S MANUAL Katharine E. Rockett University of Essex to accompany Microeconomics Fifth Edition David Besanko Ronald Braeutigam Northwestern University with Michael Gibbs The University of Chicago Copyright © 2014 John Wiley & Sons, Inc. All rights reserved. Reproduction or translation of any part of this work beyond that permitted by Sections 107 and 108 of the 1976 United States Copyright Act without permission of the copyright owner is unlawful. Requests for permission or further information should be addressed to the Permissions Department, John Wiley & Sons, Inc. Besanko & Braeutigam – Microeconomics, 5th edition Instructor’s Manual Contents Preface to the Fifth Edition Model of Course Description for Syllabus Course Reading List Using the Supplementary Materials iv iv v vii Chapter Highlights Chapter 1: Analyzing Economic Problems Chapter 2: Demand and Supply Analysis Chapter 3: Consumer Preferences and the Concept of Utility Chapter 4: Consumer Choice Chapter 5: The Theory of Demand Chapter 6: Inputs and Production Functions Chapter 7: Costs and Cost Minimization Chapter 8: Cost Curves Chapter 9: Perfectly Competitive Markets Chapter 10: Competitive Markets: Applications Chapter 11: Monopoly and Monopsony Chapter 12: Capturing Surplus Chapter 13: Market Structure and Competition Chapter 14: Game Theory and Strategic Behavior Chapter 15: Risk and Information Chapter 16: General Equilibrium Theory Chapter 17: Externalities and Public Goods 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 17 19 Sample Questions for Exams and Assignments Analytical Problems Analytical Problems: Answers Multiple-Choice Questions Multiple-Choice Questions: Answers Short-Answer Questions Short-Answer Questions: Answers Essay Questions Essay Questions: Answers Modeling Questions Modeling Questions: Answers Copyright © 2014 John Wiley & Sons, Inc. 20 20 40 89 97 103 107 112 116 128 132 iii Besanko & Braeutigam – Microeconomics, 5th edition Instructor’s Manual Preface to the Fifth Edition Thank you for adopting Microeconomics, Fifth Edition. I hope that this manual is helpful in teaching your intermediate microeconomics course. This manual includes sample syllabi, comments on each chapter, and problem sets that can be used for exams and assignments. The entire textbook can be covered in a year-long course of 20 weeks, with two fifty-minute meetings per week and one class meeting with a teaching assistant to cover problem sets and answer questions. The material of chapters 1-9 fits in a single-term 10-week course of the same format. The basics of each chapter and a selected extension take about one week of lecture to cover. You can, of course, extend this presentation to formats with more weeks. Guidance is given below, and there is plenty of material in each chapter for more in-depth treatments. Conversely, the book is sufficiently modular that you needn’t cover it in its entirety. The book is conceptually challenging for intermediate level students but very accessible mathematically. It appeals to a wide range of students, from the beginners to the advanced, and from the "mathy" students to the "talkers". The form of evaluation you choose can be equally flexible, as indicated with the different styles of problems in this manual. An exam that utilizes essays, multiple-choice, and analytical questions allows students with many different learning styles to achieve. Another advantage of the book is that the learning-by-doing approach lends itself to student participation, even in large lecture courses. I sprinkle learning-by-doing examples and multiple-choice questions throughout my lecture after I go through each concept and encourage students to participate in solving the problems. They respond well to this and it makes the lectures lively. This manual is just one of many teaching and learning resources that include the text, a Solutions Manual, a Test Bank, Student Practice Quizzes, a Mobile Access Pack, and other lecture materials (such as PowerPoint slides and an Image Gallery). These materials should be used together to achieve maximum effect. Comments on how this can be done are included throughout this manual. While I have made every effort not to duplicate problems from the Instructor’s Manual elsewhere, it is a good idea to check that they do not appear in any of the other supplements before using these problems for an exam or assignment. Of course, any comments or suggestions that you have on the text or the supplemental materials would be gratefully received. I hope that you enjoy teaching from this material. Model of Course Description for Syllabus Economics is the social science that deals with the allocation of limited resources to satisfy unlimited human wants. Broadly speaking, economics is composed of two branches: microeconomics and macroeconomics. Microeconomics studies the economic behavior of individual economic decisionmakers, such as consumers, workers, firms, or managers. It also analyzes the interaction and behavior of groups of these individuals, such as households, industries, markets, labor unions, and trade associations. This framework is absolutely fundamental to understanding an enormous range of phenomena in business, public policy, social behavior, and a variety of other fields. We will begin with an overview of the equilibrium behavior of competitive markets. The main tools that economists use to analyze the behavior of such markets are the demand curve, the supply curve, and the notion of market equilibrium, which characterizes the interaction of the forces of demand and supply. We will then spend the rest of the term going beyond our overview to understand how market demand curves and market supply curves come about. We will do this by building up a model of consumer preferences and consumer choice, which can be used to derive a market demand curve. Next, we build up a model of the theory of production and firm behavior to derive a market supply curve. At the end of the term, we will return to the concept of market equilibrium with our more detailed understanding of demand and supply in order to derive further properties of market behavior and conduct policy analysis. Copyright © 2014 John Wiley & Sons, Inc. iv Besanko & Braeutigam – Microeconomics, 5th edition Instructor’s Manual The type of analysis we conduct in the first term is called partial equilibrium because it characterizes behavior in a single market. We will spend the first week of the second term analyzing equilibrium when many markets exist and interact. This is called general equilibrium analysis. We will also derive some welfare properties of competitive markets for both partial and general equilibrium. Next, we move beyond competitive industry structures to consider various other commonly-observed industry structures such as monopoly and oligopoly. We will observe how industry equilibrium differs from the competitive case for each of these structures. After this, we introduce uncertainty into our analysis of equilibrium. We conclude the term with a discussion of externalities and public goods. As a whole, the approach of the second term is more topical than that of the first term. Microeconomic analysis relies on a small set of enormously powerful analytical tools: constrained optimization analysis, equilibrium analysis, and comparative statics analysis. This course attempts to help you master these tools by presenting their graphical, algebraic, and logical mechanics, as well as by illustrating their use in many different contexts. Course Reading List Each chapter takes approximately one week to cover thoroughly. I allocate the following amount of time, where each "session" represents one fifty-minute lecture (generally two lectures per week). I supplement each week's material with a class meeting with a teaching assistant to review problem sets. Chapter 1: Analyzing Economic Problems Chapter 2: Demand and Supply Analysis Chapter 3: Consumer Preferences and the Concept of Utility Chapter 4: Consumer Choice Chapter 5: The Theory of Demand Chapter 6: Inputs and Production Functions Chapter 7: Costs and Cost Minimization Chapter 8: Cost Curves Chapter 9: Perfectly Competitive Markets Chapter 10: Competitive Markets: Applications Chapter 11: Monopoly and Monopsony Chapter 12: Capturing Surplus Chapter 13: Market Structure and Competition Chapter 14: Game Theory and Strategic Behavior Chapter 15: Risk and Information Chapter 16: General Equilibrium Theory Chapter 17: Externalities and Public Goods 1-1/2 sessions 2-1/2 sessions 2 sessions 2 sessions 3 sessions 1-1/2 sessions 1-1/2 sessions 2 sessions 3 sessions 1-1/2 sessions 2 sessions 2 sessions 4 sessions 2 sessions 2 sessions 3 sessions 2 sessions Schedule one session each term for a mid-term test and a review session. Based on this schedule, you can expect to be able to design the following types of courses: 1. 20-week course: All the chapters can be covered. Schedule one midterm exam after Chapter 5 and a review session after Chapter 9. Schedule one midterm exam after Chapter 14 in the second term and a review session after Chapter 17. NOTE: I suggest moving Chapter 16 to the beginning of the second term. For courses with two midterms per term, schedule the midterms following Chapters 5, 8, 12, and 14. 2. 10-week course: A standard microeconomics one-term course would cover the first 9 chapters over 10 weeks, with a midterm exam after Chapter 5 and a review session after Chapter 9. You may wish to assign section 10.1 of Chapter 10 to cover the invisible hand results. This may be added easily to the material in Chapter 9 and is covered relatively quickly. Notice that general equilibrium is not included in this syllabus. Copyright © 2014 John Wiley & Sons, Inc. v Besanko & Braeutigam – Microeconomics, 5th edition Instructor’s Manual If you wish to schedule two midterms, do so after Chapters 5 and 8. 3. 4. 15-week course: Cover the first 9 chapters over 9-1/2 weeks. Cover Chapter 10.1 at the end of Chapter 9's material. After this, the remaining course can be designed in several ways: a. For an emphasis on market structure, include chapters 11-14. Schedule midterms after Chapters 5 and 11. (Note: I have left time for review lectures.) b. For an emphasis on regulation, follow the first 9 chapters and 10.1 with the rest of 10, 11, 12, 15 and 17. Schedule midterms after Chapters 5 and 12. c. For an emphasis on general public policy and welfare, follow the first 9 chapters with Chapters 10, 11, 12, 16, and 17. This will probably leave you a bit short on time, so cut out all except the first-degree price discrimination portion of Chapter 12 (i.e., assign only Chapter sections 12.1 and 12.2). Schedule midterms after Chapters 5 and 12. d. A variant of option (a) would emphasize antitrust analysis. This would include the same schedule as (a) but would orient the discussion towards competition law rather than strategic interactions. This text can be used in business courses. You may wish to de-emphasize the theory of demand in such a course in order to be able to spend more time on market structure. I would recommend condensing the presentation of this material by covering only the following sections of Chapters 4 and 5: 4.1, 4.2, 5.1, 5.3, and 5.4. If your course emphasizes compensation issues, cover section 5.5 quickly. This should mean that you can cover the demand side in a total of 5 sessions (2-1/2 weeks). This should leave you time, in a 15-week course, for Chapter 10.1, 11, 12, 13, and 14. Schedule midterms after Chapters 7 and 11. Copyright © 2014 John Wiley & Sons, Inc. vi Besanko & Braeutigam – Microeconomics, 5th edition Instructor’s Manual Using the Supplementary Materials Students need a lot of practice to learn this material. The end-of-chapter problems can be used for marked assignments, as the answers are contained in a separate Solutions Manual. I have found the endof-chapter problems to be very good tools for learning the material, but they are a bit easier than the level of exam I like to give. As a result, while I generally assign end-of-chapter problems for the weekly review classes with the graduate student assistants, I give at least two "self-tests" during each term. These selftests are composed of problems equal in difficulty to those on my exams and are good preparation for my final exam. At the end of this manual, you will find a large selection of problems in various formats that can be used for self-tests. Two to three of these problems should be sufficient for a 60-minute, closedbook, closed-notes self-test. Have the graduate assistants go over the self-tests in the weekly review classes. The self-tests are not intended to be marked; they are a feedback mechanism for students to gauge their progress. The Student Practice Quizzes include interactive problem sets for students to solve and obtain feedback on their efforts. The difficulty level is slightly lower than that of the additional problems in the Mobile Access Pack. The "exercises" in the text of the Mobile Access Pack and the Student Practice Quizzes can be considered to be equally difficult. PowerPoint presentations are available for each chapter's lecture. The Image Gallery, a set of enlarged graphs, charts, and illustrations from the text in PowerPoint format, is also available. For exam preparation, you can use the questions at the end of this manual, or you can use problems from the Test Bank. This bank contains multiple choice questions as well as word (analytical) problems of varying levels of difficulty. The Test Bank is somewhat easier than the practice exams in the Mobile Access Pack and is of equal difficulty to the Student Practice Quizzes. There is some minor overlap between the Student Practice Quizzes and theTest Bank, but this should amount to no more than three or four problems per chapter. A Computerized Test Bank allows you to customize your quizzes and tests for students. All the above material can be found at www.wiley.com/college/besanko. Copyright © 2014 John Wiley & Sons, Inc. vii Besanko & Braeutigam – Microeconomics, 5th edition Copyright © 2014 John Wiley & Sons, Inc. Instructor’s Manual viii Besanko & Braeutigam – Microeconomics, 5th edition Instructor’s Manual Chapter Highlights Chapter 1: Analyzing Economic Problems This chapter introduces three basic tools needed to analyze microeconomic problems: constrained optimization, equilibrium analysis, and comparative statics. These concepts are introduced on a very general level with some simple illustrations. All details are left to later chapters; however the text refers back frequently to the general tool being used. Indeed, students might wish to re-read this chapter at the end of the course to re-unify the material. Some highlights include: Nature of Microeconomic Analysis Constrained Maximization: Objective Functions and Constraints Exogenous and Endogenous Variables Marginal Reasoning The Concept of Equilibrium Comparative Statics Positive and Normative Analysis Compared This chapter sets the stage for the first part of the course (chapters 3 - 9) and draws together this material into a single “toolbox”. The main ideas are reviewed quite early in the text. Equilibrium and comparative statics is revisited in Chapter 2. Constrained optimization plays a major role in chapter 4. Some of the basic ideas of this chapter can be reviewed when you cover game theory (chapter 14) by comparing game theoretic models, equilibria, and reasoning to the constrained optimization models of chapters 3 - 9. Students enjoy the example about advertising expenditures (table 1.1). It can be used as a basis for discussion during lecture so that students can guess what the optimum would be. Usually someone gets it wrong and someone else gets it right, so it is “rewarding” as a discussion because it can be used to illustrate the value of economic analysis, but also is not too discouraging. I have included a problem (number 55) in the Analytical Problems section of this manual that expands on the cap and trade (“climate change”) example at the opening of the chapter. Notice that the framework of “cap and trade” is very similar to Application 1.2 (“The Toughest Ticket in Sports”). This problem can be extended into quite a long discussion if you include all the parts at the end. Ensuring that students can solve this problem, understand how to set up and manipulate the graph, interpret equilibrium and comparative statics using the graph, and understand the implications of cap and trade for emissions control is usually enough for the first class with a graduate teaching assistant. Copyright © 2014 John Wiley & Sons, Inc. 9 Besanko & Braeutigam – Microeconomics, 5th edition Instructor’s Manual Chapter 2: Demand and Supply Analysis Chapter 2 develops building blocks that help answer questions about the equilibrium behavior of competitive markets. These building blocks are the demand curve, the supply curve, and the notion of market equilibrium. The chapter also introduces the concept of elasticity, which helps to describe the shape of demand and supply curves. The chapter presents several "back of the envelope" methods that allow demand and supply curves to be obtained for specific markets based on a minimum of information. Some highlights include: The Market Demand Curve The Market Supply Curve Market Equilibrium Excess Supply and Demand Comparative Statics Analysis applied to Supply and Demand Elasticities Back–of-the-Envelope Calculations The first half of this chapter will be familiar to students from their Principles course. This material provides a review of the general tools of equilibrium analysis and comparative statics from Chapter 1 in a familiar context so that their more general nature can be emphasized without too much distraction. This is excellent to develop students’ ability to see the general mathematical methodology that underlies demand and supply graphs. The chapter then moves on to the difficult concept of elasticity, ranging from the calculation of elasticity to how it can be used. Students have enormous difficulty with both. Consider assigning extra problems on this or devoting an extra class session to it. The first three multiple choice questions in this manual go over price elasticity of demand, but do give extra practice from the end of chapter problems or the supplementary materials. You may also wish to ask students to write an essay as part of their problem set on why we use elasticities rather than slopes of demand curves to describe sensitivity of quantity to price. Without getting the answer to this question straight, students often have a hard time figuring out why they are bothering with elasticities in the first place. Students particularly enjoy the "Back-of-the-Envelope" segment, as it allows them to apply the material. Indeed, this chapter spends a lot of time showing students not just the calculations but how they can be used to get answers to the sort of questions real businesses and policy makers would pose. An interesting link between the students' econometrics course and this course can be made using the first “modeling question” in the Sample Questions for Exams and Assignments section. This problem can be used either to illustrate "back-of-the-envelope" techniques or can be used as a start for an econometric analysis. It would be interesting for students to see this same problem presented both in their Microeconomics course and in their Econometrics course to examine the linkages in the approaches. Many of the problems in the Mobile Access Pack and this manual cover material that is presented in more detail in Chapter 10 (government intervention and its effect on the market). You can recall these problems when you go over Chapter 10. This may make Chapter 10's material seem more accessible to students. You can also use this chapter’s problems (either here or in the Mobile Access Pack) to anticipate Chapter 9's material on the slopes of long-run and short-run supply functions. Copyright © 2014 John Wiley & Sons, Inc. 10 Besanko & Braeutigam – Microeconomics, 5th edition Copyright © 2014 John Wiley & Sons, Inc. Instructor’s Manual 11