Copyright © 2003 Pearson Education, Inc.Slide 6-1  Imperfect competition Firms are aware that they can influence the price of their product. –They know.

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Copyright © 2003 Pearson Education, Inc.Slide 6-1  Imperfect competition Firms are aware that they can influence the price of their product. –They know that they can sell more only by reducing their price. Each firm views itself as a price setter, choosing the price of its product, rather than a price taker. The simplest imperfectly competitive market structure is that of a pure monopoly, a market in which a firm faces no competition. The Theory of Imperfect Competition

Copyright © 2003 Pearson Education, Inc.Slide 6-2  Monopoly: A Brief Review Marginal revenue –The extra revenue the firm gains from selling an additional unit –Its curve, MR, always lies below the demand curve, D. –In order to sell an additional unit of output the firm must lower the price of all units sold (not just the marginal one). The Theory of Imperfect Competition

Copyright © 2003 Pearson Education, Inc.Slide 6-3 MC 2 Q2Q2 MR 2 MC 1 Q1Q1 MR 1 The Theory of Imperfect Competition Figure 6-1: Monopolistic Pricing and Production Decisions D Cost, C and Price, P Quantity, Q Monopoly profits AC PMPM QMQM MR AC MC MC 1 Q1Q1 MR 1

Copyright © 2003 Pearson Education, Inc.Slide 6-4 Marginal Revenue and Price –Marginal revenue is always less than the price. –The relationship between marginal revenue and price depends on two things: –How much output the firm is already selling –The slope of the demand curve »It tells us how much the monopolist has to cut his price to sell one more unit of output. The Theory of Imperfect Competition

Copyright © 2003 Pearson Education, Inc.Slide 6-5 –Assume that the demand curve the firm faces is a straight line: Q = A – B x P 說明；返回 (6-1) 說明返回 –Then the MR that the firm faces is given by: MR = P – Q/B (6-2) The Theory of Imperfect Competition

Copyright © 2003 Pearson Education, Inc.Slide 6-6 A firm faces the demand curve : Q = A – B x P The demand curve can rearranged to state the price as a function of the firm’s sales : P= (A / B) –(1 / B) x Q Letting R denote the firm’s revenue The Theory of Imperfect Competition R=P x Q= [ (A / B) –(1 / B) x Q ] x Q =(A / B) x Q –(1 / B) x Q 2 MR= dR dQ = (A / B) –2(1 / B) x Q = (A / B) –(1 / B) x Q–(1 / B) x Q = P–(1 / B) x Q

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