Presentation on theme: "Chapter 16 Oligopoly T1 Between Monopoly and Perfect Competition"— Presentation transcript:
1Chapter 16 OligopolyT1 Between Monopoly and Perfect CompetitionT2 Markets with only a few sellersT3 Game theory and the economics of cooperationT4 Public policy toward oligopolies
2T1 Between Monopoly and Perfect Competition The cases of perfect competition and monopoly illustrate some important ideas about how markets work. Most markets in the economy, however, include elements of both these cases and therefore, are not completely described by either of them.The typical firm in the economy faces competition and also has some degree of market power; however, the competition and market power are not exactly described and analyzed by the perfect competition and monopoly. In other words, the typical firm in our economy is imperfectly competitive.There are two types of imperfectly competitive markets.An oligopoly is a market with only a few sellers, each offering a product similar or identical to the others.
3Examples: the market for hockey skates; the world market for crude oil. Monopolistic competition describes a market structure in which there are many firms selling products that are similar but not identical.Examples: the markets for novels, movies, CDs and computer games.See Figure 16-1 on page 353, four types of market structure.T2 Markets with only a few sellersBecause an oligopolistic market has only a small group of sellers, a key feature of oligopoly is the tension between cooperation and self-interest.The group of oligopolists is best off cooperating and acting like a monopolist-producing a small quantity of output and charging a price above MC.
4Yet because each oligopolist cares about only its own profit, there are powerful incentives at work that hinder a group of firms from maintaining the monopoly outcome.A duopoly exampleImage a town in which only two residents, Jack and Jill, own wells that produce water safe for drinking.Each Saturday, Jack and Jill decide how many litres of water to pump, bring the water to town, and sell it for whatever price the market will bear.We assume that Jack and Jill can pump as much water as they want without cost. That is, the marginal cost of water equals zero.See Table 16-1 on page 354. It shows the town’s demand schedule for water.
5Competition, monopolies and cartels Suppose the market for water is perfectly competitivePrice = MC ( = 0) Price=0 and Quantity = 120L.Suppose the market for water is monopolyTable 16-1 shows that the total profit is maximized at a quantity of 60 L and a price of 60 a litre.This result would be inefficient, for the quantity of water produced and consumed would fall short of the socially efficient level of 120 L.What outcome should we expect from our duopolists?If Jack and Jill were to collude monopoly outcomeOur two producers would produce a total of 60 L, which would be sold at a price of $60 a litre.Price exceeds marginal cost and the outcome is socially inefficient
6Collusion: an agreement among firms in a market about quantities to produce or prices to charge Cartel: a group of firms acting in unisonA cartel must agree not only on the total level of production but also on the amount produced by each member.Although oligopolists would like to form cartels and earn monopoly profits, often that is not possible. Why? Pursuing own self-interestOligopolists would be better off cooperating and reaching the monopoly outcome. Yet because they pursue their own self-interest, they do not end up reaching the monopoly outcome and maximizing their joint profit.Each oligopolist is tempted to raise production and capture a larger share of the market. As each of them tries to do this, total production rises and the price falls.
7At the same time, self-interest does not drive the market all the way to the competitive outcome. Oligopolists are aware that increases in the amount they produce reduce the price of their product..In summary, when firms in an oligopoly individually choose production to maximize profit, they produce a quantity of output greater than the level produced by monopoly and less than the level produced by competition. The oligopoly price is less than the monopoly price but greater than the competitive price ( which equals marginal cost)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.
8T3 Game theory and the economics of cooperation Game theory: the study of how people behave in strategic situations. By “ strategic” we mean a situation in which each person, when deciding what actions to take, must consider how others might respond to that action.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 firm produce. In making its production decision, each firm in an oligopoly should consider how its decision might affect the production decisions of all the other firms.Game theory is not necessary for understanding competitive or monopoly markets. Why?
9Prisoners’ Dilemma: a particular game between two captured prisoners that illustrates why cooperation is difficult to maintain even when it is mutually beneficialThree elements of a game: player, strategy and payoff.Dominant strategy: a strategy that is best for a player in a game regardless of the strategies chosen by the other players.Dominated strategy:a strategy that is worst for a player in a game regardless of the strategies chosen by the other players. It also can be eliminatedNash Equilibrium: a situation in which economic actors interacting with one another each choose their best strategy given the strategies that all the other actors have chosen.We can get the Nash Equilibrium by dominant strategy, dominated strategy or cell by cell inspection.
10Simultaneous game vs. Sequential game See Figure 16-2 on page 360 (Prisoners’ Dilemma)(Confess, Confess) is the Nash EquilibriumThis result is the inferior outcome.Dominant strategySee Figure 16-3 on page 362 (Crude Oil production game)(High Production, High Production) is the Nash EquilibriumThis result is the inferior outcome with low profits for each country.See Figure 16-4 on page 363 Arms-race game ( to build new weapons or to disarm)(Arm, Arm) is the Nash Equilibrium
11This result is the inferior outcome in which both countries are at risk Dominant strategySee Figure 16-5 on page 364 Advertising Game(Advertise, Advertise) is the Nash EquilibriumThis result is the inferior outcome with lower profits for each companySee Figure 16-6 on page 365 A Common Resources Game( Drill Two Wells, Drill Two Wells) is the Nash EquilibriumDominant strategy.
12See Figure 16-7 on page 366 Jack and Jill’s Oligopoly Game ( Sell 40 L, Sell 40 L) is the Nash EquilibriumThis result is the inferior outcome with lower profits for each companyDominant strategy.T4 Public policy toward oligopoliesRestraint of trade and the competition ActFreedom to make contracts is an essential part of a market economy. However, Canadian judges have refused to enforce agreements that restrain trade among competitors (reducing quantities and raising prices, or price-fixing) to be against the public interest.
13Canada’s Competition Act codifies and reinforces this policy Canada’s Competition Act codifies and reinforces this policy. See Section 45(1) of the Act.The Competition Act contains both civil and criminal provisions.Civil provision:such as merger cases are heard by Competition TribunalCriminal provision:such as conspiracies in restraint of trade, bid-rigging, price discrimination, resale price maintenance and predatory pricingThe Attorney General of Canada
14Controversies over competition policy Over time, much controversy has centred on the question of what kinds of behaviour competition laws should prohibit. Most commentators agree that price-fixing agreements among competing firms should be illegal.However, the competition laws have been used to condemn some business practices whose effects are not obvious. The followings are three examples.Ex1 Resale Price Maintenance ( also called fair trade)The manufacturer requires the retailers to charge customers a certain price. Charging any price lower than the requested price would be treated as the retailers’ violation of contract with the manufacturer.Resale price maintenance might seem anticompetitive and therefore, detrimental to society. Like an agreement among members of a cartel, it prevents the retailers
15from competing on price from competing on price. For this reason, the courts have often viewed resale price maintenance as a violation of competition laws.Economists defend resale price maintenance on two grounds. First, they deny that it is aimed at reducing competition. To the extent that the manufacturer has any market power, it can exert that power through the wholesale price rather than through resale price maintenance. Moreover, a cartel of retailers sells less than a group of competitive retailers, the manufacturer would be worse off if its retailers were a cartel. So, the manufacturer has no incentive to discourage competition among its retailers. Second, economists believe that resale price maintenance has a legitimate goal. The manufacturer may want its retailers to provide customers with a pleasant showroom and a knowledgeable sales force.
16Yet without resale price maintenance, some customers would take advantage of one store’s service to learn about the product and then buy the product at a discount retailer that does not provide this service.Resale price maintenance is one way for the manufacturer to solve this free-rider problem.An important principle: business practices that appear to reduce competition may in fact have legitimate purposes.Therefore, this principle makes the application of the competition laws all the more difficult.Ex2 Predatory PricingFirms with market power normally use that power to raise prices above the competitive level. But should policymakers ever be concerned that firms with market
17power might charge prices that are too low? Imagine that price war among Air Can and other small airline companies. Air Can’s price cuts may be intended to drive small companies out of the market; so Air Can may recapture its monopoly and raise prices again.Some economists are skeptical of this argument and believe that predatory pricing is rarely, and perhaps never, a profitable business strategy. Why? For a price war to drive out a rival, prices have to be driven below cost.Ex3 Tying (selling products as a bundle)The practice of tying is banned under the civil provisions of the Competition Act because tying allows a firm to extend its market power to other goods.Economists, however, are skeptical of this argument.