曼昆微观经济学第五版 第十六章 课文PPT英文版

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1、Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Oligopoly Chapter 16 Copyright 2001 by Harcourt, Inc. All rights reserved. Requests for permission to make copies of any part of the work should be mailed to: Permissions Department, Harcourt College Publishers, 6277 Sea Harbor

2、Drive, Orlando, Florida 32887-6777. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Imperfect Competition Imperfect competition refers to those market structures that fall between perfect competition and pure monopoly. Harcourt, Inc. items and derived items copyright 2001 by

3、Harcourt, Inc. Imperfect Competition Imperfect competition includes industries in which firms have competitors but do not face so much competition that they are price takers. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Types of Imperfectly Competitive Markets Oligopoly On

4、ly a few sellers, each offering a similar or identical product to the others. Monopolistic Competition Many firms selling products that are similar but not identical. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. The Four Types of Market Structure Monopoly Oligopoly Monopol

5、istic Competition Perfect Competition Tap water Cable TV Tennis balls Crude oil Novels Movies Wheat Milk Number of Firms? Type of Products? Many firms One firm Few firms Differentiated products Identical products Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Markets With On

6、ly a Few Sellers Because of the few sellers, the key feature of oligopoly is the tension between cooperation and self-interest. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Characteristics of an Oligopoly Market Few sellers offering similar or identical products Interdepen

7、dent firms Best off cooperating and acting like a monopolist by producing a small quantity of output and charging a price above marginal cost Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. A Duopoly Example A duopoly is an oligopoly with only two members. It is the simplest

8、type of oligopoly. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. A Duopoly Example: Demand Schedule for Water QuantityPriceTotal Revenue0$120$ 0101101,100201002,00030902,70040803,20050703,50060603,60070503,50080403,20090302,700100202,000110101,10012000Harcourt, Inc. items a

9、nd derived items copyright 2001 by Harcourt, Inc. A Duopoly Example: Price and Quantity Supplied The price of water in a perfectly competitive market would be driven to where the marginal cost is zero: P = MC = $0 Q = 120 gallons The price and quantity in a monopoly market would be where total profi

10、t is maximized: P = $60 Q = 60 gallons Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. A Duopoly Example: Price and Quantity Supplied The socially efficient quantity of water is 120 gallons, but a monopolist would produce only 60 gallons of water. So what outcome then could b

11、e expected from duopolists? Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Competition, Monopolies, and Cartels The duopolists may agree on a monopoly outcome. Collusion The two firms may agree on the quantity to produce and the price to charge. Cartel The two firms may join

12、 together and act in unison. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Competition, Monopolies, and Cartels Although oligopolists would like to form cartels and earn monopoly profits, often that is not possible. Antitrust laws prohibit explicit agreements among oligopol

13、ists as a matter of public policy. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. The Equilibrium for an Oligopoly A Nash equilibrium is a situation in which economic actors interacting with one another each choose their best strategy given the strategies that all the others

14、 have chosen. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. The Equilibrium for an Oligopoly When firms in an oligopoly individually choose production to maximize profit, they produce quantity of output greater than the level produced by monopoly and less than the level pro

15、duced by competition. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. The Equilibrium for an Oligopoly The oligopoly price is less than the monopoly price but greater than the competitive price (which equals marginal cost). Harcourt, Inc. items and derived items copyright 200

16、1 by Harcourt, Inc. Summary of Equilibrium for an Oligopoly Possible outcome if oligopoly firms pursue their own self-interests: Joint output is greater than the monopoly quantity but less than the competitive industry quantity. Market prices are lower than monopoly price but greater than competitiv

17、e price. Total profits are less than the monopoly profit. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. A Duopoly Example: Demand Schedule for Water QuantityPriceTotal Revenue0$120$ 0101101,100201002,00030902,70040803,20050703,50060603,60070503,50080403,20090302,700100202,0

18、00110101,10012000Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. How the Size of an Oligopoly Affects the Market Outcome How increasing the number of sellers affects the price and quantity: The output effect: Because price is above marginal cost, selling more at the going pri

19、ce raises profits. The price effect: Raising production lowers the price and the profit per unit on all units sold. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. How the Size of an Oligopoly Affects the Market Outcome As the number of sellers in an oligopoly grows larger, a

20、n oligopolistic market looks more and more like a competitive market. The price approaches marginal cost, and the quantity produced approaches the socially efficient level. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Game Theory and the Economics of Cooperation Game theor

21、y is the study of how people behave in strategic situations. Strategic decisions are those in which each person, in deciding what actions to take, must consider how others might respond to that action. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Game Theory and the Econom

22、ics of Cooperation Because the number of firms in an oligopolistic market is small, each firm must act strategically. Each firm knows that its profit depends not only on how much it produced but also on how much the other firms produce. Harcourt, Inc. items and derived items copyright 2001 by Harcou

23、rt, Inc. The Prisoners Dilemma The prisoners dilemma provides insight into the difficulty in maintaining cooperation. Often people (firms) fail to cooperate with one another even when cooperation would make them better off. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. The

24、Prisoners Dilemma Bonnies Decision Confess Remain Silent Confess Remain Silent Clydes Decision Clyde gets 8 years Bonnie gets 8 years Bonnie gets 20 years Bonnie gets 1 year Bonnie goes free Clyde gets 20 years Clyde gets 1 year Clyde goes free Harcourt, Inc. items and derived items copyright 2001 b

25、y Harcourt, Inc. The Prisoners Dilemma The dominant strategy is the best strategy for a player to follow regardless of the strategies pursued by other players. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. The Prisoners Dilemma Cooperation is difficult to maintain, because

26、cooperation is not in the best interest of the individual player. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Oligopolies as a Prisoners Dilemma Iraqs Decision High Production Low Production High Production Low Production Irans Decision Iran gets $40 billion Iraq gets $40

27、 billion Iraq gets $30 billion Iraq gets $50 billion Iraq gets $60 billion Iran gets $30 billion Iran gets $50 billion Iran gets $60 billion Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Oligopolies as a Prisoners Dilemma Self-interest makes it difficult for the oligopoly t

28、o maintain a cooperative outcome with low production, high prices, and monopoly profits. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. An Arms-Race Game Decision of the United States (U.S.) Arm Disarm Arm Disarm Decision of the Soviet Union (USSR) USSR at risk U.S. at risk

29、U.S. at risk and weak U.S. safe U.S. safe and powerful USSR at risk and weak USSR safe USSR safe and powerful Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. An Advertising Game Marlboros Decision Advertise Dont Advertise Advertise Dont Advertise Camels Decision Camel gets $3

30、 billion profit Marlboro gets $3 billion profit Marlboro gets $2 billion profit Marlboro gets $4 billion profit Marlboro gets $5 billion profit Camel gets $2 billion profit Camel gets $4 billion profit Camel gets $5 billion profit Harcourt, Inc. items and derived items copyright 2001 by Harcourt, In

31、c. A Common-Resources Game Exxons Decision Drill Two Wells Drill One Well Drill Two Wells Drill One Well Arcos Decision Arco gets $4 million profit Exxon gets $4 million profit Exxon gets $3 million profit Exxon gets $5 million profit Exxon gets $6 million profit Arco gets $3 million profit Arco get

32、s $5 million profit Arco gets $6 million profit Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Why People Sometimes Cooperate Firms that care about future profits will cooperate in repeated games rather than cheating in a single game to achieve a one-time gain. Harcourt, Inc

33、. items and derived items copyright 2001 by Harcourt, Inc. Jack and Jills Oligopoly Game Jacks Decision Sell 40 gallons Sell 30 gallons Sell 40 gallons Sell 30 gallons Jills Decision Jill gets $1,600 profit Jack gets $1,600 profit Jack gets $1,500 profit Jack gets $1,800 profit Jack gets $2,000 prof

34、it Jill gets $1,500 profit Jill gets $1,800 profit Jill gets $2,000 profit Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Public Policy Toward Oligopolies Cooperation among oligopolists is undesirable from the standpoint of society as a whole because it leads to production t

35、hat is too low and prices that are too high. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Restraint of Trade and the Antitrust Laws Antitrust laws make it illegal to restrain trade or attempt to monopolize a market. Sherman Antitrust Act of 1890 Clayton Act of 1914 Harcour

36、t, Inc. items and derived items copyright 2001 by Harcourt, Inc. Controversies over Antitrust Policy Antitrust policies sometimes may not allow business practices that have potentially positive effects: Resale price maintenance Predatory pricing Tying Harcourt, Inc. items and derived items copyright

37、 2001 by Harcourt, Inc. Resale Price Maintenance Resale price maintenance (or fair trade) occurs when suppliers (like wholesalers) require the retailers that they sell to, to charge customers a specific amount. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Predatory Pricing

38、 Predatory pricing occurs when a large firm begins to cut the price of its product(s) with the intent of driving its competitor(s) out of the market. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Tying Tying refers to when a firm offers two (or more) of its products togethe

39、r at a single price, rather than separately. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Summary Oligopolists maximize their total profits by forming a cartel and acting like a monopolist. If oligopolists make decisions about production levels individually, the result is

40、a greater quantity and a lower price than under the monopoly outcome. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Summary The prisoners dilemma shows that self-interest can prevent people from maintaining cooperation, even when cooperation is in their mutual self-interest

41、. The logic of the prisoners dilemma applies in many situations, including oligopolies. Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Summary Policymakers use the antitrust laws to prevent oligopolies from engaging in behavior that reduces competition. Harcourt, Inc. items

42、and derived items copyright 2001 by Harcourt, Inc. Graphical Review Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. The Four Types of Market Structure Monopoly Oligopoly Monopolistic Competition Perfect Competition Tap water Cable TV Tennis balls Crude oil Novels Movies Wheat

43、 Milk Number of Firms? Type of Products? Many firms One firm Few firms Differentiated products Identical products Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. The Prisoners Dilemma Bonnies Decision Confess Remain Silent Confess Remain Silent Clydes Decision Clyde gets 8 ye

44、ars Bonnie gets 8 years Bonnie gets 20 years Bonnie gets 1 year Bonnie goes free Clyde gets 20 years Clyde gets 1 year Clyde goes free Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Oligopolies as a Prisoners Dilemma Iraqs Decision High Production Low Production High Product

45、ion Low Production Irans Decision Iran gets $40 billion Iraq gets $40 billion Iraq gets $30 billion Iraq gets $50 billion Iraq gets $60 billion Iran gets $30 billion Iran gets $50 billion Iran gets $60 billion Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. An Arms-Race Game

46、Decision of the United States (U.S.) Arm Disarm Arm Disarm Decision of the Soviet Union (USSR) USSR at risk U.S. at risk U.S. at risk and weak U.S. safe U.S. safe and powerful USSR at risk and weak USSR safe USSR safe and powerful Harcourt, Inc. items and derived items copyright 2001 by Harcourt, In

47、c. An Advertising Game Marlboros Decision Advertise Dont Advertise Advertise Dont Advertise Camels Decision Camel gets $3 billion profit Marlboro gets $3 billion profit Marlboro gets $2 billion profit Marlboro gets $4 billion profit Marlboro gets $5 billion profit Camel gets $2 billion profit Camel

48、gets $4 billion profit Camel gets $5 billion profit Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. A Common-Resources Game Exxons Decision Drill Two Wells Drill One Well Drill Two Wells Drill One Well Arcos Decision Arco gets $4 million profit Exxon gets $4 million profit Ex

49、xon gets $3 million profit Exxon gets $5 million profit Exxon gets $6 million profit Arco gets $3 million profit Arco gets $5 million profit Arco gets $6 million profit Harcourt, Inc. items and derived items copyright 2001 by Harcourt, Inc. Jack and Jills Oligopoly Game Jacks Decision Sell 40 gallons Sell 30 gallons Sell 40 gallons Sell 30 gallons Jills Decision Jill gets $1,600 profit Jack gets $1,600 profit Jack gets $1,500 profit Jack gets $1,800 profit Jack gets $2,000 profit Jill gets $1,500 profit Jill gets $1,800 profit Jill gets $2,000 profit