Chapter 6 Competitors and CompetitionChapter Contents 1) Introduction 2) Competitor Identification and Market Definition • The Basics of Competitor Identification • Putting Competitor Identification to Practice Example 6.1: Substitutes and Competition in the Postal Service • Empirical Approaches to Competitor Identification • Geographic Competitor Identification 3) Measuring Market Structure Example 6.2: Defining Coca-Cola’s Market 4) Market Structure and Competition • Perfect Competition Example 6.3: A Dog-Eat-Dog World: The Demise of the Online Pet Supply Industry • Monopoly Example 6.4: The OPEC Cartel • Monopolistic Competition Example 6.5: Pricing in the Airline Industry • Oligopoly Example 6.6: Cournot Equilibrium in the Corn Wet Milling Industry 5) Evidence on Market Structure and Performance • Price and Concentration • Other Studies of the Determinants of Profitability 6) Chapter Summary 7) Questions The chapter concludes with a discussion of evidence on the relationship of market structure and firm and industry performance. The chapter discusses how each of these characteristics discourages any one firm from raising its prices and why industry profits are driven to zero. the effects of advertising on price. the link between economies of scale and market structure. these confirm that prices and profits are systematically related to industry structure. An oligopoly is a market in which the actions of individual firms materially affect the industry price level. and connection between concentration and profitability. the chapter discusses a qualitative way to define a market: two products are in the same market if they are substitutes. the last sections of this chapter summarize the results of research on the relationship between price and concentration. The chapter introduces two theories on how firms behave in an oligopolistic market – the Cournot quantity competition model and the Bertrand price competition model. . this chapter considers several approaches to defining markets and identifying competitors: demand elasticities. consumers perceive the product to be homogeneous. Monopolistic competition describes markets in which there are many sellers and each seller is slightly differentiated from the rest. In this market. For the most part. define markets. price correlations and trade flows. oligopolistic markets. First. and describe market structure. Specifically. The above examination suggests that market structure is related to the level of prices and profitability that prevail in any given market. which are further elaborated on in chapters 7 and 8.Chapter Summary This chapter explores the link between market structure and competition. The chapter begins with a discussion of how to identify competitors. This chapter then considers competition and financial performance within four broad classes of market structure: perfectly competitive markets. After defining substitutes. The chapter also introduces two ways to measure how concentrated the market is: the N-firm concentration ratio and the Herfindahl Index. A market is perfectly competitive (see Economics Primer) if there are many sellers. and excess capacity exists. monopolistically competitive markets. and monopoly markets. Standard Industry Classification (SIC) System: The SIC system is used by the U.) Herfindahl Index: a way to measure how concentrated an industry is by summing the squared market shares of all the firms in the market. The SIC system is a set of arbitrary definitions for product markets. Trade Flows: a method for defining a geographic market. Horizontal Differentiation: making a product distinctive from those of competitors. A geographic market is properly identified if (1) the firms in that market must draw most of their customers from that area. business activity. some consumers would prefer product A and other consumers would prefer product B. Monopsonist: a firm is a monopsonist if it faces little or no competition in one of its input markets. Two products are substitutes if an increase (decrease) in the price of one leads to an increase (decrease) in the quantity demanded of the other. their price changes should be highly correlated. Market Definition: process of identifying the market or markets in which a firm competes. If two sellers are in the same market. In theory. based on the assumption that each firm selects a price and meets all demand for that product at that price. In other words. Substitutes: products tend to be close substitutes if a) they have the same or similar product performance characteristics. monopsony is a market with many sellers. b) they have the same or similar occasions for use. (2) the customers residing in that market make most of their purchases from sellers in that market. SIC codes identify different products and services by a sevendigit identifier.8. Overview . products A and B would be vertically differentiated if all consumers agreed that product A is higher quality. with each digit representing a finer degree of classification.S. based on the assumption that each firm selects a quantity to produce. Cournot Price Competition: a model designed to explain how firms will behave in an oligopoly. but only one buyer. Bertrand Price Competition: a model which explains how firms will behave in an oligopoly. and 20-firmconcentration ratios are common. Note that what constitutes “better than” or “higher quality” is often difficult to determine. Vertical Differentiation: making a product “better than” the products of competitors. c) they are sold in the same geographic market. Bureau of the Census to analyze and report on U. and the resulting total output determines market price. If products A and B were horizontally differentiated.Definitions Market Structure: number and size of firms that compete within a market. N-firm Concentration Ratio: a way to measure how concentrated an industry is by giving the combined market share of the N largest firms in the market.S. Price Correlations: a way of determining whether two sellers are in the same market. (4. The chapter provides two great examples of market definition and competition. airlines are not only competing with other airlines for customers. or locally. micro-breweries do not represent a significant percentage of the beer sold in the US. Examples: Defining a Market A key learning point of this chapter is that there are many possible ways to define a market and the definition of market is often highly contested. while industries with high fixed costs are more likely to have Cournot dynamics. would you consider the train from New York to Philadelphia to be a substitute for the airplane? (yes) Clearly. in certain local markets. an oligopoly or monopoly? • Can you think of industries that have Bertrand or Cournot dynamics? Industries that produce agricultural products or commodities tend to have Bertrand dynamics. which will help students understand some of the ways to define a market. if anything. monopolistically competitive. Out of all possible definitions of a market. • For example. the postal service and the soft drink industry. they may be competing with other forms of transportation or even other forms of communication. regionally. On a national level. some are better than others and it is important to realize which definition of a market is more appropriate. .As a means of introducing many of the topics in this chapter. it would be a huge mistake for United to use a narrow definition of market and not check how much a train or bus ticket costs to go from Philadelphia to New York. The above discussion should generate plenty of examples. 2) The airline industry: In certain routes/markets. However. micro-breweries represent a fairly large market share and it would be a mistake to ignore their presence. did firms do to insulate themselves from these forces? • Was the product or service that their firm sold homogenous or heterogeneous? • What were some of the substitutes for the product or service that (your) firm produced? • Do the substitutes that come to mind fit the definition of substitute given in the chapter? • Is geography a factor in defining this market? • Were there many competitors or is this industry dominated by a few firms? • What was the pricing competition like in this industry? • Did your firm have control over pricing? • Did your firm face any competition in the market for inputs? • Was this industry government-regulated and what effect did government regulation have on pricing and competition? • Would you characterize this industry as perfectly competitive. The following examples will help students understand how there are many possible definitions of a market and how your competitive analysis of a market will change depending upon what market definition you adopt: 1) The beer industry: One can define the beer industry nationally. ask students to draw on their own work experience and identify the competitors in an industry with which they are familiar: • What were the key forces shaping the nature of competition and the opportunities for making profit in that industry? • What. Market Structure This chapter discusses four broad types of markets: perfect competition. flying from New York to California? (no) • What are some other substitutes for air travel? (i. When reviewing quantitative ways to define a market. telephone. Sellers have no control over prices and P=MC. In perfectly competitive and monopolistically competitive markets. it may be helpful to review the characteristics of a perfectly competitive market… 1) there are many sellers 2) consumers perceive the product to be homogenous 3) excess capacity exists …and how each of these features contributes to fierce pressure to reduce prices. gold. shampoo.e. The n-firm concentration ratio is not sensitive to variations in dispersions between the market shares. It does not mean that one product is better than another for all consumers. Branded products and restaurants are great examples of monopolistically competitive markets. coffee. one class of consumers prefers a good with a certain characteristic while another class of consumers would prefer something else. fax. The key difference between monopolistic competition and perfect competition is that under monopolistic competition the goods produced by each seller are horizontally differentiated. some buyers are willing to pay slightly more for a good produced by one seller than another. are useful because they often provide data necessary to apply the quantitative techniques to define a market and measure market structure. Examples of monopolistic competitive markets include: dry cleaners. it is important to point out the difference between the n-firm concentration ratio and the Herfindahl index. Antitrust cases. etc. videoconferencing. oligopoly and monopoly. laundry detergent. like silver. barley. Although the theory of perfect competition was introduced in the Economics Primer. The text points out that geography is an important source of differentiation. Rather. sugar. Monopolistic competition encompasses a huge number of markets today. etc.) • How close to substitutes are they? • How close to substitutes are they likely to become as technology evolves? Quantitative Ways to Define a Market To understand the quantitative ways to define a market. many markets are almost perfectly competitive. toothpaste. etc. In an oligopoly. the pricing .• What about the train from New York to California vs. Examples of perfectly competitive markets include commodities and agricultural products (which are often traded on exchanges). jeans. monopolistic competition. as companies constantly try to differentiate their products from their competitors. such as the proposed AT&T and Bellsouth. peanut butter. like the Herfindahl index and nfirm concentration ratio. however. rollerblades. it is useful to have the students prepare some cases in conjunction with this chapter. Although few markets are perfectly competitive in the sense that each firm faces a perfectly horizontal demand curve for a homogenous product. As a result. entry is a constant threat and sellers disregard the choices of specific competitors. while the Herfindahl index takes these variations into account. the monopolist could cut back on production and increase profits. a firm might have monopoly power because of the following reasons: patent. Baxter in surgical gloves and Xerox in copiers in the 1960s and early 1970s. There are instances where monopolies are deemed efficient and acceptable. There are very few firms that have monopoly power and there is anti-trust legislation in the US designed to break up firms that have monopoly power. Examples of monopolies include: Wal-Mart in mass merchandising in many towns. or economies of scale. LA Gear. If marginal revenue < marginal cost. A monopolist produces less than firms in an oligopoly. The example in the chapter also illustrates that profits of these firms are less in an oligopoly than if they acted as a monopoly. copyrights. The athletic footwear industry (Nike. until recently. and can charge higher prices as a result. and Converse) is a great example of an oligopoly and one to which most students can relate. in other words. Patent and copyright laws reward innovation and investments in R&D. However. government license. due to the large fixed costs in the utility industry. For example. phone. If marginal revenue > marginal cost. A monopolist will produce until marginal revenue = marginal cost. firms in an oligopoly do not work to maximize industry profits. Here. it may be helpful to work through the Cournot and Bertrand model example provided in the chapter. Unlike in a perfectly competitive market.and production strategies of individual firms in a market affect the industry price. electric. then the monopolist could still produce more and increase profits. . a monopoly firm has complete control over pricing and the quantity it chooses to produce. and gas utilities were run as monopolies and were regulated by the government. HBS 9-391-076 (see earlier chapters) Harnischfeger Industries: Portal Crains (HBS #9-391-130): This case further explores the link between market structure and competition. . economies of scale and scope. You may want to ask students to think of the following questions in preparation for the case: a) Describe the key drivers to Caterpillar’s historical success. De Beers Consolidated Mines. Dana. exit and entry decisions and the long run dynamics of industry. Concludes with a description of some environmental changes occurring in the early 1980’s. is facing increasing competition in the portal crane industry and wants to regain market share without engaging in a price war. Describes the structure and evolution of the earth moving equipment industry worldwide in the post war era. Includes details on CAT’s manufacturing. Discussion typically covers horizontal boundaries of the firm. 1 These descriptions have been adapted from Harvard Business School 1995-96 Catalog of Teaching Materials.S. b) Describe changes in the competitive environment and explain how these changes might impact CAT. particularly focusing on developments in the 1980’s and 1970’s. marketing research and development and organizational policies. Harnischfeger. and simple strategic positioning. Describes Caterpillar’s strategy in becoming the dominant worldwide competitor with industry market share exceeding 50%. and raises the question of how these might effect Caterpillar Tractor Co. The U.’s record 1981 performance and require changes in its highly successful strategy. Airline Industry in 1995. Northwestern University (HBS also has a case with the same title): This case focuses on the US airline industry and serves as an introduction to industry analysis. The Oil Tanker Shipping Industry in 1983: (HBS #9-384-034): This case provides an example of industry capacity overexpansion in the shipping industry in 1983. the market share leader. The case also discusses yield management and other operations aspects of the industry. J.Suggested Harvard Case Study1 Caterpillar HBS 9-385-276 . ” Journal of Law and Economics. Amsterdam: North Holland. The Handbook of Industrial Organization.). R. G.). The Handbook of Industrial Organization. Willig (eds. Stigler. The Economics of Information and Uncertainty. 1988: pp. Willig. 1933. Willig (eds. “Theories of Oligopoly Behavior. R. L. 6 in Willig. 259-316. 1982. “Entry and Competition in Concentrated Markets.” in McCall. '"The Gains from Merger or Collusion in Product-Differentiated Industries. Reiss. and P.” Journal of Law and Economics. 1989. The Theory of Monopolistic Competition. Cambridge. “Studies of Structure and Performance. 68. and T. 1977.. and R. J. Cambridge. Weiss. Amsterdam: North-Holland. 1989: 997-1009 Chamberlin. 1989. Hogarty. and A.J.H. New York: Harcourt Brace Jovanavich. pp.). and T. Panzar. C. IL: University of Chicago Press. Contestable Markets and the Theory of Industry Structure.” The Accounting Review. M.. and R. “Interindustry Studies of Structure and Performance. Schmalensee. 28."Journal of Industrial Economics. (ed. (ed.). 33. 1978:1-18.. The Handbook of Industrial Organization. pp. MA: MIT Press. R. J. K. 1993. Baumol. Betrand. W. and R. pp. Porter. Sherwin. 1989. 555-585. “'The Capacity Expansion Decision in a Growing Oligopoly: The Case of Corn Wet Milling. Bresnahan.427-444. 229-263. “The Problem of Geographic Market Definition Revisited: The Case of Coal. J. Amsterdam: North Holland. Chicago. Schmalensee (eds. Peltzman.” in chap..” Journal of Political Economy. . T. and R. 23.Extra Readings The sources below provide additional resources concerning the theories and examples of the chapter. 1985: pp. MA: Harvard University Press. 1982."Antitrust Bulletin. 99. “The Extent of the Market. E. Eizinga.. 1989. Shapiro. Bresnahan. “The Gains and Losses from Industrial Concentration. and R. 20.M.” in Schmalensee R. “Disclosure Policy and Competition: Cournot vs.). Masako N. Baker. Schmalensee. 534-561. Sam. R. Darrough. Concentration and Price.” in Schmalensee. Spence. How would you go about identifying the market served by these schools? The market can be identified in part by the customers and by residual demand analysis. this would tend to identify the ‘elite’ schools as a separate market. The higher is the cross-price elasticity. The restaurant will be profitable if it has a superior location. Why are the concepts of own and cross-price elasticities of demand essential to competitor identification and market definition? The magnitude of consumer responses to changes in a product market’s (or industry’s) price is measured by the own-price elasticity of demand. but it does not identify what those substitutes might be. we conclude that the market under consideration faces close substitute products (or the product market competes with other product markets). The cross-price elasticity measures the percentage change in demand for good Y that results from a 1. 2. We can identify substitutes by measuring the cross-price elasticity of demand between two products. how can a restaurant be profitable? The restaurant industry can be described as exhibiting monopolistic competition as there are many sellers in the market but each seller is slightly differentiated from the rest.percent change in good X. Failing . To determine if the ‘elite’ schools comprised a separate market. If these schools collectively raised their prices compared to other schools (controlling for changes in demand) and did not see a drop in their enrollment (revenues). it was necessary to determine whether certain ‘elite’ schools (mainly the Ivy League schools and MIT) constituted a separate market. If the applicants were from the same pool of high-school students and if they did not apply outside the ‘elite’ schools. Measuring the own-price elasticity of demand tells us whether a product faces close substitutes. no matter how differentiated the product. the ambience and décor and the location. If an industry raises price and consequently loses most of its customers to another industry (or industries). In addition. A restaurant can be horizontally differentiated by the type of cuisine its serves. Consumers will tend to not travel long distances for their meal. The consumers will weigh the convenience of the location against the price of the meal and so cross-price elasticity of demand may be high. How would you characterize the nature of competition in the restaurant industry? Are there submarkets with distinct competitive pressures? Are there important substitutes that constrain pricing? Given these competitive issues. 3. we could study the pricing and enrollment history of these schools to see if their pricing decisions were constrained by the possibility that consumers will switch to sellers outside the market. the quality of the food. the more readily consumers substitute between two goods when the price of one good is increased. which equals the percentage change in a product market’s sales that results from a 1 percent change in price. The prices that can be charged for these differentiating features are constrained in large part by the geographic location of the restaurant and the local competition. then they may constitute a separate market. the service. Substitutes to restaurant meals are home prepared meals and frozen dinners.Answers to End of Chapter Questions 1. In a recent antitrust case. we could conduct a survey to uncover who the applicants to these schools (consumers) were and which other schools did these applicants apply to. then you can apply this reasoning to a variety of markets. so that consumer demand is relatively inelastic. and their homes are equally spaced along the street. There are 100 video rental customers in Linesville. What does this have to do with the revenue destruction effect? When a firm expands its output. which is 10 miles long. How does the calculation of demand responsiveness in Linesville change if customers rent two videos at a time? What intuition can you draw from this about the magnitude of price competition in various types of markets? Recall from the chapter that there is a video store at each end of Straight Street. transportation costs would be a smaller percentage of their total costs and customers would be willing to travel further if one video store charged less than the other did. the price generally falls. If you think of ‘transportation costs’ as ‘horizontal differentiation’. the greater the divergence between its private gain and the revenue destruction effect from output expansion. Each firm seeks to maximize its own profit and not total industry profit. It determines the limits on firms' abilities to profit from collective price increases and thus shapes profit opportunities in environments where firms are able to coordinate their pricing behavior to more closely resemble that of a monopolist. As product differentiation declines in importance. . they take two factors into account: the price that each store charges for a video and the cost of travelling to the store. 4. When customers decide which store to visit. it reduces the market price and thus lowers the sales revenue of its rivals—this is referred to at the “revenue destruction effect”. Each store carries identical inventory. The firm level price elasticity of demand indicates the percentage change in a firms quantity demanded per percentage change in price when that firm changes its price but other competing firms do not. What does this have to do with the revenue destruction effect? Smaller firms often have greater incentives to reduce prices than do larger firms. What is the “revenue destruction effect”? As the number of Cournot competitors in a market increases. they would become less important in the transaction and a store could gain more from the price decrease. Thus. the greater is the divergence between the Cournot equilibrium and the collusive outcome. This suggests that as the number of firms in an industry exhibiting Cournot competition increases. the greater is the potential for price wars and reductions in overall profits. This elasticity will determine the perceived benefits from a price cut aimed at stealing business from competitors. This elasticity thus shapes industry profitability by influencing the likelihood of destabilizing price-cutting behavior by firms. the stronger the temptation is on the part of a firm to cut price. How does industry-level price elasticity of demand shape the opportunities for making profit in an industry? How does firm-level price elasticity of demand shape the opportunities for making profit in an industry? The industry price elasticity of demand indicates the percentage change in quantity demanded per percentage change in price when all firms simultaneously change price. a restaurant can be profitable by creating a loyal following for its horizontally differentiated product.that. The smaller is a firm’s share of industry sales. Intuitively. if customers rent two videos at a time. the greater the firm-level elasticity of demand. The larger the elasticity is (in absolute value). As transportation costs decrease as a percentage of total costs. supermarkets. Hence. product differentiation. an industry with a high concentration ratio that has a small number of sellers is able to engage more successfully in tacit collusion. might affect margins? An important source of variations in price-cost margins across industries is due to regulation. If each firm’s share of industry sales is large. prices tend to be higher in concentrated markets. However. and the concentration of buyers. it is difficult to control for the way in which price cost margins are calculated.01 = 0. b. a. What market definitions might they propose? Why would this change the Herfindahl? Pepsi should consider a market definition that would cause the market shares of firms to appear more fragmented.12 = Herfindahl index = .12 = Herfindahl index = . Pepsi could respond by offering a different market definition.32 + .27 If Pepsi and 7-Up merged: . Pepsi—30%. Compute the Herfindahl for the soft drink market.42 + . Also. Federal antitrust agencies would be concerned to see a Herfindahl increase of the magnitude you computed in (a). including cement.42 + . railroad freight. . He finds that with few exceptions. All other brands—10%. Pepper—10%.16+.consumers are more willing to switch to another product. 6. The relationship described in question 7 does not always appear to hold.09+. and might challenge the merger. The following are the approximate market shares of different brands of soft drinks during the 1980’s: Coke—40%.16+.01+. Consider an industry with a high concentration ratio because there are a small number of Cournot competitors. accounting cost data usually allow the researcher to infer average cost rather than marginal cost. Since the predictions of economic theory pertain to the market between price and marginal cost. total industry output and price are closer to the levels that would be chosen by a profitmaximizing monopolist. What factors.33 The assumptions of the above include that the market shares of firms in the industry do not change as a result of the merger of two players (Pepsi and 7-Up). This would have the affect of making the market Pepsi competes in more fragmented. price-cost margins should be computed using marginal cost. 5. Compute the most merger Herfindahl. Pepsi should attempt to increase the size of the denominator that determines its market share.16+. That is. Alternatively. Numerous studies have shown that there is usually a systematic relationship between concentration and price. besides the number of firms in the market. the divergence between a firm’s private gain and the revenue destruction effect from output expansion is small. 7. and gasoline retailing. For example. 7-Up—10%. Leonard Weiss summarized he results of price and concentration studies in over 20 industries. Dr. Pepsi might argue that the market definition is the “junk food market” – which includes chips and candy. Suppose Pepsi acquired 7-Up.42 + .01 = 0.12 + . the nature of sales transactions. What assumptions did you make? . What is this relationship? Offer two brief explanations for this relationship. Each has a constant marginal cost of $20. The two firms.. Chuckie B Corp. Hence. The dancing machine industry is a duopoly. The demand curve for the industry is P=100 – Q. compete through Cournot quantity-setting competition.2Q1 . Consider a market with two horizontally differentiated firms.5Q2 = Q1 = 30 .5Q1) Q1 = 20 and so by symmetry Q2 = 20 To find P we use the market demand curve: P = 100 – Q = 100 – Q1 – Q2 = 100 – 20 – 20 = $60 And finally each firm’s profits: Π1 = P1Q1 – TC1 = (60*20) – (40*20) = 1200 – 800 = $400 and so by symmetry Π2 = P2Q2 – TC2 = (60*20) – (40*20) = 1200 – 800 = $400 11.5Q2 (2) Max Π2 = 100 . Show that the equilibrium price is $60.5Q1 Now solve the above simultaneously: Q1 = 30 . Demand functions are: Qx = 100 – 2Px + 1Py Qy = 100 – 2Py + 1Px Calculate the Bertrand equilibrium in prices in the market: Notice the form of the demand function – the quantity X sells increases as the price Y charges increases.Q2 -40 Q1 = 30 .Q2 ) Q2 -40 Q2 Now take the derivative of each of the above with respect to Q: (1) Max Π1 = 100 .Q2 ) Q1 -40 Q1 (2) Π2 = P2Q2 – TC2 = (100 . with each firm producing 20 machines and earning profits of $400.2Q2 . .. Prices would not necessarily fall to MC if the firms faced capacity constraints.. the each firm improves its profits by undercutting its rival and capturing a windfall in sales. where Q is the total quantity produced by Chuckie B and Gene Gene.Q1 .Q1 . each firm has marginal cost of $40 and no fixed cost.Q1 -40 Q2 = 30 .10.. The only stable price combination is at the point when both firms are charging MC. Currently.5(30 . X and Y. and Gene Gene Dancing Machines.. (1) Π1 = P1Q1 – TC1 = (100 .