17-Discussion Questions Solutions

# 17-Discussion Questions Solutions - Lecture 17: Monopoly...

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Lecture 17: Monopoly Suggested questions and exercises (Pindyck and Rubinfeld, Ch.10). Questions: 1, 2, 3 ,5 Exercises: 6, 8, 9, 11, 15, 16 Additional Discussion Question (Based on Past Midterms and Finals). QUESTIONS 1. A monopolist is producing at a point at which marginal cost exceeds marginal revenue. How should it adjust its output to increase profit? When marginal cost is greater than marginal revenue, the incremental cost of the last unit produced is greater than incremental revenue. The firm would increase its profit by not producing the last unit. It should continue to reduce production, thereby decreasing marginal cost and increasing marginal revenue, until marginal cost is equal to marginal revenue. 2. We write the percentage markup of prices over marginal cost as (P - MC)/P. For a profit-maximizing monopolist, how does this markup depend on the elasticity of demand? Why can this markup be viewed as a measure of monopoly power? We can show that this measure of market power is equal to the negative inverse of the price elasticity of demand. P MC P E D   1 The equation implies that, as the elasticity increases (demand becomes more elastic), the inverse of elasticity decreases and the measure of market power decreases. Therefore, as elasticity increases (decreases), the firm has less (more) power to increase price above marginal cost. 3. Why is there no market supply curve under conditions of monopoly? The monopolist’s output decision depends not only on marginal cost, but also on the demand curve. Shifts in demand do not trace out a series of prices and quantities that we can identify as the supply curve for the firm. Instead, shifts in demand lead to changes in price, output, or both. Thus, there is no one-to- one correspondence between the price and the seller’s quantity; therefore, a monopolized market lacks a supply curve. 5. What are some of the different types of barriers to entry that give rise to monopoly power? Give an example of each. The f irm’s ability to exercise monopoly power depends on how easy it is for other firms to enter the industry. There are several barriers to entry, including exclusive rights (e.g., patents, copyrights, and licenses) and economies of scale. These two barriers to entry are the most common. Exclusive rights are legally granted property rights to produce or distribute a good or service. Positive economies of scale lead to “natural monopolies” because the largest producer can charge a lower price, driving competition from the market. For example, in the production of aluminum, there is evidence to suggest that there are scale economies in the conversion of bauxite to alumina. (See U.S. v. Aluminum Company of America , 148 F.2d 416 [1945], discussed in Exercise 8, below.)

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EXERCISES 6. Suppose that an industry is characterized as follows: C 100 2 Q 2 Firm total cost function MC 4 Q Firm marginal cost function P 90 2 Q Industry demand curve MR 90 4 Q Industry marginal revenue curve .
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## This note was uploaded on 11/30/2010 for the course ECON 251 taught by Professor Tontz during the Fall '10 term at USC.

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17-Discussion Questions Solutions - Lecture 17: Monopoly...

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