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Monopolistic Competition
1.
Copyright©2004 South-Western 1717Monopolistic Competition
2.
Copyright © 2004
South-Western Monopolistic Competition • Imperfect competition refers to those market structures that fall between perfect competition and pure monopoly.
3.
The Four Types
of Market Structure Copyright © 2004 South-Western • Tap water • Cable TV Monopoly (Chapter 15) • Novels • Movies Monopolistic Competition (Chapter 17) • Tennis balls • Crude oil Oligopoly (Chapter 16) Number of Firms? Perfect • Wheat • Milk Competition (Chapter 14) Type of Products? Identical products Differentiated products One firm Few firms Many firms
4.
Copyright © 2004
South-Western Monopolistic Competition • Types of Imperfectly Competitive Markets • Monopolistic Competition • Many firms selling products that are similar but not identical. • Oligopoly • Only a few sellers, each offering a similar or identical product to the others.
5.
Copyright © 2004
South-Western Monopolistic Competition • Markets that have some features of competition and some features of monopoly.
6.
Copyright © 2004
South-Western Monopolistic Competition • Attributes of Monopolistic Competition • Many sellers • Product differentiation • Free entry and exit
7.
Copyright © 2004
South-Western Monopolistic Competition • Many Sellers • There are many firms competing for the same group of customers. • Product examples include books, CDs, movies, computer games, restaurants, piano lessons, cookies, furniture, etc.
8.
Copyright © 2004
South-Western Monopolistic Competition • Product Differentiation • Each firm produces a product that is at least slightly different from those of other firms. • Rather than being a price taker, each firm faces a downward-sloping demand curve.
9.
Copyright © 2004
South-Western Monopolistic Competition • Free Entry or Exit • Firms can enter or exit the market without restriction. • The number of firms in the market adjusts until economic profits are zero.
10.
Copyright © 2004
South-Western COMPETITION WITH DIFFERENTIATED PRODUCTS • The Monopolistically Competitive Firm in the Short Run • Short-run economic profits encourage new firms to enter the market. This: • Increases the number of products offered. • Reduces demand faced by firms already in the market. • Incumbent firms’ demand curves shift to the left. • Demand for the incumbent firms’ products fall, and their profits decline.
11.
Figure 1 Monopolistic
Competition in the Short Run Copyright©2003 Southwestern/Thomson Learning Quantity0 Price Profit- maximizing quantity Price Demand MR ATC (a) Firm Makes Profit Average total cost Profit MC
12.
Copyright © 2004
South-Western COMPETITION WITH DIFFERENTIATED PRODUCTS • The Monopolistically Competitive Firm in the Short Run • Short-run economic losses encourage firms to exit the market. This: • Decreases the number of products offered. • Increases demand faced by the remaining firms. • Shifts the remaining firms’ demand curves to the right. • Increases the remaining firms’ profits.
13.
Figure 1 Monopolistic
Competitors in the Short Run Copyright©2003 Southwestern/Thomson Learning Demand Quantity0 Price Price Loss- minimizing quantity Average total cost (b) Firm Makes Losses MR Losses ATC MC
14.
Copyright © 2004
South-Western The Long-Run Equilibrium • Firms will enter and exit until the firms are making exactly zero economic profits.
15.
Figure 2 A
Monopolistic Competitor in the Long Run Copyright©2003 Southwestern/Thomson Learning Quantity Price 0 Demand MR ATC MC Profit-maximizing quantity P =ATC
16.
Copyright © 2004
South-Western Long-Run Equilibrium • Two Characteristics • As in a monopoly, price exceeds marginal cost. • Profit maximization requires marginal revenue to equal marginal cost. • The downward-sloping demand curve makes marginal revenue less than price. • As in a competitive market, price equals average total cost. • Free entry and exit drive economic profit to zero.
17.
Copyright © 2004
South-Western Monopolistic versus Perfect Competition • There are two noteworthy differences between monopolistic and perfect competition—excess capacity and markup.
18.
Copyright © 2004
South-Western Monopolistic versus Perfect Competition • Excess Capacity • There is no excess capacity in perfect competition in the long run. • Free entry results in competitive firms producing at the point where average total cost is minimized, which is the efficient scale of the firm. • There is excess capacity in monopolistic competition in the long run. • In monopolistic competition, output is less than the efficient scale of perfect competition.
19.
Figure 3 Monopolistic
versus Perfect Competition Copyright©2003 Southwestern/Thomson Learning Quantity0 Price Demand (a) Monopolistically Competitive Firm Quantity0 Price P = MC P = MR (demand curve) (b) Perfectly Competitive Firm MC ATC MC ATC MR Efficient scale P Quantity produced Quantity produced = Efficient scale
20.
Copyright © 2004
South-Western Monopolistic versus Perfect Competition • Markup Over Marginal Cost • For a competitive firm, price equals marginal cost. • For a monopolistically competitive firm, price exceeds marginal cost. • Because price exceeds marginal cost, an extra unit sold at the posted price means more profit for the monopolistically competitive firm.
21.
Figure 3 Monopolistic
versus Perfect Competition Copyright©2003 Southwestern/Thomson Learning Quantity0 Price Demand (a) Monopolistically Competitive Firm Quantity0 Price P =MC P =MR (demand curve) (b) Perfectly Competitive Firm Markup MC ATC MC ATC MR Marginal cost P Quantity produced Quantity produced
22.
Figure 3 Monopolistic
versus Perfect Competition Copyright©2003 Southwestern/Thomson Learning Quantity0 Price Demand (a) Monopolistically Competitive Firm Quantity0 Price P = MC P = MR (demand curve) (b) Perfectly Competitive Firm Markup Excess capacity MC ATC MC ATC MR Marginal cost Efficient scale P Quantity produced Quantity produced = Efficient scale
23.
Copyright © 2004
South-Western Monopolistic Competition and the Welfare of Society • Monopolistic competition does not have all the desirable properties of perfect competition.
24.
Copyright © 2004
South-Western Monopolistic Competition and the Welfare of Society • There is the normal deadweight loss of monopoly pricing in monopolistic competition caused by the markup of price over marginal cost. • However, the administrative burden of regulating the pricing of all firms that produce differentiated products would be overwhelming.
25.
Copyright © 2004
South-Western Monopolistic Competition and the Welfare of Society • Another way in which monopolistic competition may be socially inefficient is that the number of firms in the market may not be the “ideal” one. There may be too much or too little entry.
26.
Copyright © 2004
South-Western Monopolistic Competition and the Welfare of Society • Externalities of entry include: • product-variety externalities. • business-stealing externalities.
27.
Copyright © 2004
South-Western Monopolistic Competition and the Welfare of Society • The product-variety externality: • Because consumers get some consumer surplus from the introduction of a new product, entry of a new firm conveys a positive externality on consumers. • The business-stealing externality: • Because other firms lose customers and profits from the entry of a new competitor, entry of a new firm imposes a negative externality on existing firms.
28.
Copyright © 2004
South-Western ADVERTISING • When firms sell differentiated products and charge prices above marginal cost, each firm has an incentive to advertise in order to attract more buyers to its particular product.
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South-Western ADVERTISING • Firms that sell highly differentiated consumer goods typically spend between 10 and 20 percent of revenue on advertising. • Overall, about 2 percent of total revenue, or over $200 billion a year, is spent on advertising.
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South-Western ADVERTISING • Critics of advertising argue that firms advertise in order to manipulate people’s tastes. • They also argue that it impedes competition by implying that products are more different than they truly are.
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South-Western ADVERTISING • Defenders argue that advertising provides information to consumers • They also argue that advertising increases competition by offering a greater variety of products and prices. • The willingness of a firm to spend advertising dollars can be a signal to consumers about the quality of the product being offered.
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South-Western Brand Names • Critics argue that brand names cause consumers to perceive differences that do not really exist.
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South-Western Brand Names • Economists have argued that brand names may be a useful way for consumers to ensure that the goods they are buying are of high quality. • providing information about quality. • giving firms incentive to maintain high quality.
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South-Western Summary • A monopolistically competitive market is characterized by three attributes: many firms, differentiated products, and free entry. • The equilibrium in a monopolistically competitive market differs from perfect competition in that each firm has excess capacity and each firm charges a price above marginal cost.
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South-Western Summary • Monopolistic competition does not have all of the desirable properties of perfect competition. • There is a standard deadweight loss of monopoly caused by the markup of price over marginal cost. • The number of firms can be too large or too small.
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South-Western Summary • The product differentiation inherent in monopolistic competition leads to the use of advertising and brand names. • Critics argue that firms use advertising and brand names to take advantage of consumer irrationality and to reduce competition. • Defenders argue that firms use advertising and brand names to inform consumers and to compete more vigorously on price and product quality.
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