© 2006 McGraw-Hill Ryerson Limited. All rights reserved.1 Chapter 11: Monopoly Prepared by: Kevin Richter, Douglas College Charlene Richter, British Columbia Institute of Technology

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 2 Chapter Objectives 1. Summarize how and why the decisions facing a monopolist differ from the decisions of perfectly competitive firms. 2a. Explain why MC = MR maximizes total profit for a monopolist. 2b. Determine a monopolist's price, output, and profit graphically and numerically.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 3 Chapter Objectives 3. Understand that a monopolist can make a profit, break even, or make a loss. 4. Show graphically the welfare loss from monopoly. 5. Explain why a price-discriminating monopolist will earn more profit than a single- price monopolist.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 4 Chapter Objectives 6. Explain why there would be no monopoly without barriers to entry. 7. Describe three normative arguments against monopoly. 8. Analyze monopoly pricing in a social context.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 5 Introduction Monopoly is a market structure in which a single firm makes up the entire market. Monopolies exist because of barriers to entry into a market that prevent competition.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 6 Introduction Legal barriers, such as patents, prevent others from entering the market. Sociological barriers – entry is prevented by custom or tradition.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 7 Introduction Natural barriers – the firm has a unique ability to produce what other firms can’t duplicate. Technological barriers – the size of the market can support only one firm.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 8 Differences Between a Monopolist and a Perfect Competitor A competitive firm's marginal revenue is the market price. A monopolistic firm’s marginal revenue is not its price – it takes into account that in order to sell more it has to decrease the price of its product.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 9 Monopolist’s Price and Output Numerically The first thing to remember is that marginal revenue is the change in total revenue that occurs as a firm changes its output.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 10 MR = MC Determines the Profit- Maximizing Output If MR > MC, the monopolist gains profit by increasing output. If MR < MC, the monopolist gains profit by decreasing output. If MC = MR, the monopolist is maximizing profit.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 11 Price a Monopolist Charges The MR = MC condition determines the quantity a monopolist produces. The monopolist will charge the maximum price consumers are willing to pay for that quantity. That price is found on the demand curve.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 12 Determine Monopoly Price and Output MC $ Price D MR Monopolist price

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 13 Comparing Monopoly and Perfect Competition $ Price MC D MR Monopolist price Competitive price

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 14 Profits and Monopoly The monopolist will make a profit if price exceeds average total cost. The monopolist will make a normal return if price equal average total cost. The monopolist will incur a loss if price is less than average total cost.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 15 Monopolist Making a Profit Price ATC MC Quantity PMPM 0 MR D QMQM Profit CMCM A B

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 16 Monopolist Breaking Even Price MC Quantity PMPM 0 MR D QMQM ATC

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 17 Monopolist Making a Loss Price ATC MC Quantity0 MR D QMQM Loss PMPM CMCM B A

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 18 Welfare Loss from Monopoly The welfare loss of a monopolist is represented by the triangles B and D. The welfare loss is often called the deadweight loss or welfare loss triangle.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 19 A C PMPM D B MC MRD QMQM PCPC QCQC 0 Price Quantity Welfare Loss from Monopoly

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 20 Price-Discriminating Monopolist Price discrimination is the ability to charge different prices to different individuals or groups of individuals.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 21 Price-Discriminating Monopolist In order to price discriminate, a monopolist must be able to:  Identify groups of customers who have different elasticities of demand;  Separate them in some way; and  Limit their ability to resell its product between groups.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 22 Price-Discriminating Monopolist A price-discriminating monopolist can increase both output and profit. It can charge customers with more inelastic demands a higher price. It can charge customers with more elastic demands a lower price.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 23 Price-Discriminating Monopolist A perfect price discriminating monopoly will stop expanding its output when MR = MC, which corresponds to the perfectly competitive output. The deadweight loss is therefore eliminated under perfect price discrimination.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 24 Perfect Price Discrimination D=MR MC MR Quantity (number of consumers) Price

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 25 Economies of Scale A natural monopoly is an industry in which one firm can produce at a lower cost than can two or more firms.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 26 Barriers to Entry and Monopoly Economies of scale:  In cases of natural monopoly, technology is such that minimum efficient scale is so large that average total costs decrease over the range of potential output.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 27 0Quantity Average Cost Natural Monopoly C3C3 C2C2 C1C1 Q⅓Q⅓ ATC Q½Q½ Q1Q1

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 28 Economies of Scale There is no welfare loss in the natural monopoly situation. There can actually be a welfare gain because a single firm is so much more efficient than several firms producing the good.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 29 Natural Monopoly Loss MR D PMPM PCPC C CMCM QMQM QCQC ATC MC 0Quantity Average Cost Profit

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 30 Barriers to Entry and Monopoly Set-up costs:  In many industries high set-up costs characterize production.  The industry may be highly capital-intensive, requiring a large investment in expensive but highly specialized capital.  Examples are an oil refinery or a diamond mine.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 31 Barriers to Entry and Monopoly Set-up costs:  In some industries a lot of money may be spent on advertising.  Heavy advertising creates a barrier to entry in those cases, such as in the perfume industry or the automobile industry.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 32 Barriers to Entry and Monopoly Legislation:  Monopolies can also exist as a result of government charter.  Patents are another way in which government can grant a company a monopoly.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 33 Barriers to Entry and Monopoly Legislation:  A patent is a legal protection of technical innovation that gives the inventor a monopoly on using the invention.  To encourage research and development of new products, government gives out patents for a wide variety of innovations.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 34 Barriers to Entry and Monopoly Other barriers to entry:  Sometimes one company can gain ownership of some essential aspect of the production process – a unique input, or control over a resource.  An example is DeBeers. By controlling the world- wide distribution network for diamonds, the company enjoys a monopoly in the diamond industry.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 35 Normative Views of Monopoly The public does not like the distributional effects of monopoly. They believe that it transfers income from “deserving” consumers to “undeserving” monopolists.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 36 Government Policy and Monopoly: AIDS Drugs The patents for AIDS drugs are owned by a small group of pharmaceutical companies. They can charge a very high price for a drug whose marginal cost is very low.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 37 Government Policy and Monopoly: AIDS Drugs What, if anything, should the government do?  Government could force the producer to charge a price equal to its marginal cost.  Society would be better off but this would create a significant disincentive for drug companies to do further research on other life-threatening diseases.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved. 38 Government Policy and Monopoly: AIDS Drugs Another alternative is for the government to buy the patents and allow anyone to produce the drugs.  Payment would come from increased taxes and would be quite expensive.  The cost of regulation would decrease, but it would raise the question as to which patents the government should buy.

© 2006 McGraw-Hill Ryerson Limited. All rights reserved.39 Monopoly End of Chapter 11