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16 Oligopoly

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BETWEEN MONOPOLY AND PERFECT COMPETITION Imperfect competition refers to those market structures that fall between perfect competition and pure monopoly.

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BETWEEN MONOPOLY AND PERFECT COMPETITION Imperfect competition includes industries in which firms have competitors but do not face so much competition that they are price takers.

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BETWEEN MONOPOLY AND PERFECT COMPETITION Types of Imperfectly Competitive Markets Oligopoly Only 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.

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Figure 1 The Four Types of Market Structure

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MARKETS WITH ONLY A FEW SELLERS Because of the few sellers, the key feature of oligopoly is the tension between cooperation and self-interest.

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MARKETS WITH ONLY A FEW SELLERS Characteristics of an Oligopoly Market Few sellers offering similar or identical products Interdependent firms Best off cooperating and acting like a monopolist by producing a small quantity of output and charging a price above marginal cost

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A Duopoly Example A duopoly is an oligopoly with only two members. It is the simplest type of oligopoly.

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Table 1 The Demand Schedule for Water

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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 profit is maximized: P = $60 Q = 60 gallons

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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 be expected from duopolists?

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Competition, Monopolies, and Cartels The duopolists may agree on a monopoly outcome. Collusion An agreement among firms in a market about quantities to produce or prices to charge. Cartel A group of firms acting in unison.

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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 oligopolists as a matter of public policy.

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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 have chosen.

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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 produced by competition.

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The Equilibrium for an Oligopoly The oligopoly price is less than the monopoly price but greater than the competitive price (which equals marginal cost).

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Equilibrium for an Oligopoly Summary 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 competitive price. Total profits are less than the monopoly profit.

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Table 1 The Demand Schedule for Water

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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 price raises profits. The price effect: Raising production will increase the amount sold, which will lower the price and the profit per unit on all units sold.

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How the Size of an Oligopoly Affects the Market Outcome As the number of sellers in an oligopoly grows larger, an oligopolistic market looks more and more like a competitive market. The price approaches marginal cost, and the quantity produced approaches the socially efficient level.

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GAME THEORY AND THE ECONOMICS OF COOPERATION Game theory 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.

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GAME THEORY AND THE ECONOMICS 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 produces but also on how much the other firms produce.

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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.

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The Prisoners’ Dilemma The prisoners’ dilemma is a particular “game” between two captured prisoners that illustrates why cooperation is difficult to maintain even when it is mutually beneficial.

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Figure 2 The Prisoners’ Dilemma

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The Prisoners’ Dilemma The dominant strategy is the best strategy for a player to follow regardless of the strategies chosen by the other players.

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The Prisoners’ Dilemma Cooperation is difficult to maintain, because cooperation is not in the best interest of the individual player.

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Figure 3 An Oligopoly Game

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Oligopolies as a Prisoners’ Dilemma Self-interest makes it difficult for the oligopoly to maintain a cooperative outcome with low production, high prices, and monopoly profits.

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Figure 4 An Arms-Race Game

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Figure 5 An Advertising Game

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Figure 6 A Common-Resource Game

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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.

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Figure 7 Jack and Jill Oligopoly Game

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PUBLIC POLICY TOWARD OLIGOPOLIES Cooperation among oligopolists is undesirable from the standpoint of society as a whole because it leads to production that is too low and prices that are too high.

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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

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Controversies over Antitrust Policy Antitrust policies sometimes may not allow business practices that have potentially positive effects: Resale price maintenance Predatory pricing Tying

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Controversies over Antitrust Policy Resale Price Maintenance (or fair trade) occurs when suppliers (like wholesalers) require retailers to charge a specific amount 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 Tying when a firm offers two (or more) of its products together at a single price, rather than separately

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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 a greater quantity and a lower price than under the monopoly outcome.

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Summary The prisoners’ dilemma shows that self-interest can prevent people from maintaining cooperation, even when cooperation is in their mutual self-interest. The logic of the prisoners’ dilemma applies in many situations, including oligopolies.