# Week 3: Monopoly and Duopoly

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1 EC202, University of Warwick, Term 2 1 of 34 Week 3: Monopoly and Duopoly Dr Daniel Sgroi Reading: 1. Osborne Sections 3.1 and 3.2; 2. Snyder & Nicholson, chapters 14 and 15; 3. Sydsæter & Hammond, Essential Mathematics for Economics Analysis, Section 4.6. With thanks to Peter J. Hammond.

2 EC202, University of Warwick, Term 2 2 of 34 Outline 1. Monopoly 2. Cournot s model of quantity competition 3. Bertrand s model of price competition

3 EC202, University of Warwick, Term 2 3 of 34 Cost, Demand and Revenue Consider a firm that is the only seller of what it produces. Example: a patented medicine, whose supplier enjoys a monopoly. Assume the monopolist s total costs are given by the quadratic function C = αq + βq 2 of its output level Q 0, where α and β are positive constants. For each Q, its selling price P is assumed to be determined by the linear inverse demand function P = a bq for Q 0, where a and b are constants with a > 0 and b 0. So for any nonnegative Q, total revenue R is given by the quadratic function R = PQ = (a bq)q. As a function of output Q, profit is given by π(q) = R C = (a bq)q αq βq 2 = (a α)q (b + β)q 2

4 EC202, University of Warwick, Term 2 4 of 34 Profit Maximizing Quantity Completing the square (no need for calculus!), we have π(q) = π M (b + β)(q Q M ) 2, where Q M = a α 2(b + β) and π M = (a α)2 4(b + β) So the monopolist has a profit maximum at Q = Q M, with maximized profit equal to π M. The monopoly price is P M = a bq M = a b a α 2(b + β) = b(a + α) + 2aβ 2(b + β) This is valid if a > α; if a α, the firm will not produce, but will have Q M = 0 and π M = 0. The two cases are illustrated in the next two slides.

5 EC202, University of Warwick, Term 2 5 of 34 π = 0. The two cases are illustrated in Figs. 2 and 3. In F the left of Q = 0 is dashed, because it is not really relevan that Q 0. The Positive price and Output cost associated with Q M in ( ) c Introduction Monopoly Cournot Duopoly Bertrand Summary π Q M 2Q M Q Figure 2 The profit function, a>α Figure 3 Th Optimal output is positive if a > α.

6 it is not really relevant given the natural requirement ated with Q M in ( ) can be Zero found Output by routine algebra. Introduction Monopoly Cournot Duopoly Bertrand Summary π Q M Q Q Figure 3 The profit function, a α Optimal output is zero if a α. EC202, University of Warwick, Term 2 6 of 34

7 Profit Maximizing Price The inverse demand function is P = a bq for Q 0. As a function of price P, the output quantity is given by the demand function is Q = 1 b (a P) for 0 P a. So revenue is R = PQ = 1 b P(a P) for 0 P a. And cost is given by C = αq + βq 2 = α b (a P) + β (a P)2 b2 This implies that, as a function of the price P, profit is π = 1 b (P α)(a P) β (a P)2 b2 This time we find the maximum from the first-order condition 0 = dπ dp = 1 b (a + α 2P) + β 2(a P) b2 Again, the monopoly price is P M = b(a+α)+2aβ 2(b+β) if a > α; if a α, the firm will choose P M a to stifle all demand. EC202, University of Warwick, Term 2 7 of 34

8 EC202, University of Warwick, Term 2 8 of 34 Surplus Maximization Recall the monopolist s inverse demand function P = a bq for Q 0, and demand function Q = 1 b (a P) for 0 P a. When price is P, consumer surplus CS is measured by the integral CS = Q 0 (a bq P)dq = Q 0 [(a P)q 1 2 bq2 ] above the price line and below the inverse demand curve. So CS = (a P)Q 1 2 bq2 = 1 2 bq2 = 1 2b (a P)2 Total surplus TS is the sum of this and profit, which is TS = CS + π = 1 2 bq2 + Q(a bq) αq βq 2. This reduces to TS = (a α)q ( 1 2 b + β)q2. It is maximized when the output quantity and price are Q = a α b + 2β and P = a (a α)b b + 2β 2βa + αb = b + 2β.

9 EC202, University of Warwick, Term 2 9 of 34 Surplus Diagram Surplus is maximized when Q = Q = a α b + 2β. P a bq α 0 0 P = MC = α + 2βQ P = P P = a bq Q a/b Q

10 EC202, University of Warwick, Term 2 10 of 34 Price Taking Suppose the firm could be induced to act like a perfect competitor, by choosing an output along its marginal cost curve MC = d dq αq + βq2 = α + 2βQ. This intersects the demand curve P = a bq where a bq = α + 2βQ and so Q = Q = a α b + 2β provided that a > α. The last slide showed that this competitive output level Q is the one that maximizes total surplus. In fact, moving from Q M to Q would pass a compensation test. Is there a tax or subsidy that can persuade the firm to move to Q?

11 EC202, University of Warwick, Term 2 11 of 34 Taxing Monopoly Output Suppose the monopolist is charged a specific tax of t per unit of output. The tax payment tq is extra cost, so the new total cost function is C = αq + βq 2 + tq = (α + t)q + βq 2 To find the new profit maximizing quantity choice Q M t, carry out the same calculations as before, but with α replaced by α + t; this gives Q M t = a α t 2(b + β) if a > α + t but Q M t = 0 if a α + t.

12 EC202, University of Warwick, Term 2 12 of 34 Subsidizing Monopoly Output The objective of remedial policy should be to maximize surplus by having the firm choose Qt M = Q. This requires Q M t = a α t 2(b + β) = Q = a α b + 2β provided that a > α, with Qt M = 0 if a α. Clearing fractions, we obtain (b + 2β)(a α t) = 2(b + β)(a α) whose solution is t (a α)b = b + 2β < 0 if a > α So it is desirable to subsidize the monopolist s output in order to encourage additional production.

13 EC202, University of Warwick, Term 2 13 of 34 Taxing Monopoly Profits Subsidizing monopolists is usually felt to be unjust, and many additional complications need to be considered carefully before formulating a desirable policy for dealing with monopolists. Still the previous analysis suggests that if justice requires lowering a monopolist s price or profit, this is much better done directly than by taxing output.

14 EC202, University of Warwick, Term 2 14 of 34 Cournot Duopoly Example: Costs Suppose two identical firms, labelled 1 and 2, sell bottled mineral water. Assume that there are no fixed costs, but each firm i s variable costs of producing quantity q i are given by the quadratic cost function c i (q i ) = q 2 i for i {1, 2}.

15 EC202, University of Warwick, Term 2 15 of 34 Competitive Price-Taking The assumption in a competitive environment is that each firm will take a market price p as given, believing that its behaviour cannot influence the market price. COMMENT: Or will act as if it so believes. Each firm i chooses a quantity q i to maximize its profits. So the firms face the identical profit maximization problem max q i π i (q i ) := p q i c i (q i ) = p q i q 2 i. Note that π i (q i) = d dq i (p q i qi 2) = p 2q i so π i (q i) > 0 q i < 1 2 p and π i (q i) < 0 q i > 1 2 p. Therefore, each firm will choose its supply as a function q i (p) = 1 2p of the price p.

16 EC202, University of Warwick, Term 2 16 of 34 Elementary Economics Interpretation Economics students should know that in a perfectly competitive market, a firm s marginal cost as a function of its quantity will represent its supply curve. Here each firm i s marginal cost is the derivative C i (q i) = 2q i of its cost function. Equating marginal cost to price gives p = 2q i or q i (p) = 1 2 p, exactly the supply function derived above.

17 EC202, University of Warwick, Term 2 17 of 34 Market Demand Suppose the total consumer demand is given by p(q) = 100 q, where q represents the total quantity demanded, and p(q) is the resulting price consumers are willing to pay. Alternatively, we can write market demand as a function q D = 100 p of the price. Note: Recall that, following Cournot himself (1838), economists often invert the demand function and write price as a function of quantity, rather than quantity as a function of price. This allows for some nice graphical analyses that we will also use.

18 EC202, University of Warwick, Term 2 18 of 34 Price-Taking Equilibrium I The price-taking equilibrium occurs at a price p where the total output q 1 (p) + q 2 (p) of both firms outputs equals the demand q D (p) at the same price. Algebraically this is trivial: we need to find a price that solves q 1 (p) + q 2 (p) = p = q D(p) = 100 p. This yields p = 50, and each firm produces q i = 1 2 p = 25.

19 EC202, University of Warwick, Term 2 19 of 34 Price-Taking Equilibrium II For those used to derive the competitive equilibrium graphically from supply and demand curves, we add up the two firms supply curves horizontally, and the equilibrium is where total supply intersects the demand curve. In this competitive price-taking equilibrium each firm maximizes profits when it takes the equilibrium price p = 50 as given and chooses q i = 1 2 p = 25. Then each firm s profits are π i = = = 625.

20 EC202, University of Warwick, Term 2 20 of 34 Price Manipulation Suppose firm 1 becomes more sophisticated and realizes that reducing its output will raise the market price. Specifically, suppose it produces 24 units instead of 25. For demand to equal the new restricted supply, the price must change to p(q) = 100 q = 51, where q = = 49 instead of 50. Firm 1 s profits will then be π i = = = 648 > 625. Of course, once firm 1 realizes its power over price, it should not just set q 1 = 25 but look for its best choice. However, that choice depends on firm 2 s output quantity what will that be? Clearly, firm 2 should be just as sophisticated. Thus, we have to look for a solution that considers both actions and counter-actions of these rational and sophisticated (or well advised) firms.

21 EC202, University of Warwick, Term 2 21 of 34 Cournot Best Responses Consider the Cournot duopoly game with inverse demand p = 100 q and cost functions c i (q i ) = c i q i for firms i {1, 2}. Firm i s profit is u i (q i, q j ) = (100 q i q j ) q i c i q i. Given its belief that its opponent s quantity is q j, its best response is q i (q j) = max{0, (q j + c i )}. A (Cournot) Nash equilibrium occurs at a pair of quantities (q 1, q 2 ) that are mutual best responses. So equilibrium requires q 1 = q 1 (q 2) and q 2 = q 2 (q 1). We must solve both these best response equations simultaneously.

22 EC202, University of Warwick, Term 2 22 of 34 Zero Cost Case In the easy case with each c i = 0 the two best response functions are q 1 (q 2) = max{0, q 2} and q 2 (q 1) = max{0, q 1}. These two equations imply that qi 50 for i = 1, 2, hence their solution satisfies both q1 = q 2 and q 2 = q 1. Subtracting one equation from the other gives q 1 q 2 = 1 2 (q 2 q 1 ), so q 1 = q 2. The unique Cournot equilibrium is q 1 = q 2 =

23 EC202, University of Warwick, Term 2 23 of 34 Intersecting Best Responses In the general case when each c i < 50 you should draw a diagram in the q 1 q 2 plane of the two best response functions q 1 (q 2) = max{0, (q 2 + c 1 )} and q 2 (q 1) = max{0, (q 1 + c 2 )}. Part of each graph lies along the line segment q i = 0. The other parts are line segments joining: 1. (0, 100 c 1 ) to ( c 1, 0); 2. (0, c 2) to (100 c 2, 0). The only equilibrium occurs at the intersection of these two line segments, where q i > 0 while q 1 = (q 2 + c 1 ) and q 2 = (q 1 + c 2 ).

24 EC202, University of Warwick, Term 2 24 of 34 Graph of Best Responses Cournot equilibrium occurs at the intersection of the two firms best response functions. q c c c c 2 q 1

25 EC202, University of Warwick, Term 2 25 of 34 General Cournot Equilibrium Finding the unique equilibrium requires solving the equations q 1 = (q 2 + c 1 ) and q 2 = (q 1 + c 2 ). Adding the two equations implies that q 1 + q 2 = (q 2 + q 1 ) 1 2 (c 1 + c 2 ) and so q 1 + q 2 = (c 1 + c 2 ). Subtracting the second equation from the first implies that q 1 q 2 = 1 2 (q 2 q 1 ) 1 2 (c 1 c 2 ) and so q 1 q 2 = c 2 c 1. These equations imply that q i = c j 2 3 c i for i = 1, 2, j = 1, 2, i j. For c 2 = c 1 we have q i = c i for i = 1, 2.

26 EC202, University of Warwick, Term 2 26 of 34 Bertrand Duopoly In the Cournot model firms choose quantities, and the price adjusts to clear market demand. Joseph Bertrand in 1883 modelled duopoly when firms set prices and consumers choose where to purchase. Consider the alternative game where the two firms each post their own price for their identical goods. Assume that demand is given by p = 100 q and cost functions are c i (q i ) = c i q i for firms i {1, 2}. Assume too that 0 c 1 c 2 < 100.

27 EC202, University of Warwick, Term 2 27 of 34 Bertrand Competition The firm that posts the lower price obviously attracts all the consumers. If both prices are the same, we assume that the market is split equally between the two firms. First, consider what happens if firm i is a monopolist. It will choose quantity q to maximize (100 q)q c i q = (100 c i )q q 2. The monopoly quantity is q M i = c i. The corresponding price is p M i = 100 q M i = c i. Note how c i < 100 implies that c i < c i = p M i for i {1, 2}.

28 EC202, University of Warwick, Term 2 28 of 34 The Bertrand Normal Form Here is the normal form: Players: N = {1, 2}; Strategy sets: The firms i N choose prices p i S i = [0, ); Payoffs: The quantities are given by 100 p i if p i < p j q i (p i, p j ) = 0 if p i > p j 1 2 (100 p i) if p i = p j and the payoffs by u i (p i, p j ) = (p i c i ) q i (p i, p j ).

29 EC202, University of Warwick, Term 2 29 of 34 Bertrand Best Responses Case 1: If p j < c i then firm i does best to stay out of the market by charging p i BR i (p j ) = (p j, ). Case 2: If p j = c i then firm i does not want to capture the whole market with a lower price, but it earns zero profit for all p i BR i (p j ) = [p j, ). Case 3: If p j > c i and in fact c i < p j pi M = c i, then as long as firm i charges a price p i satisfying c i < p i < p j, it captures the whole market and earns positive profit û i (p i ) = (p i c i ) (100 p i ). Also, û i (p i) = 100 2p i + c i = 2(pi M p i ) > 0 in this interval. But by increasing the price to p i = p j, firm i gives up half the market, so its profit drops discontinuously. There is no best response, so BR i (p j ) =.

30 EC202, University of Warwick, Term 2 30 of 34 No Profit Maximum Firm i s profit is not maximized when p i = p j. firm i s profit 0 0 p j p M i p i

31 EC202, University of Warwick, Term 2 31 of 34 More Bertrand Best Responses Case 4: Suppose p j > pi M = c i > c i because c i < 100. As long as p i < p j, profits are û i (p i ) = (p i c i ) (100 p i ). Therefore û i (p i) = 100 2p i + c i 0 as p i c i = pi M. So BR i (p j ) = {pi M } = { c i}.

32 Bertrand Best Responses: Summary To summarize these four cases: (p j, ) if p j < c i [p j, ) if p j = c i BR i (p j ) = if c i < p j pi M {pi M } if p j > pi M Recall that c 1 < 100, so c i < c i = p M i for i {1, 2}. The Bertrand equilibrium set is as follows: Case A: If p1 M = c 1 c 2, then there is a set of monopoly equilibria with p 1 = p1 M = c 1 and p 2 (p1 M, ). Case B: If c 1 < c 2 < p1 M = c 1, then Bertrand equilibrium does not exist. Case C: In the symmetric case with c 1 = c 2 = c, there is a unique Bertrand equilibrium with p 1 = p 2 = c, as under perfect competition. EC202, University of Warwick, Term 2 32 of 34

33 EC202, University of Warwick, Term 2 33 of 34 Analysing Non-Existence Why is there no equilibrium in Case B, when c 1 < c 2 < p M 1 = c 1? Suppose the lower cost firm 1 enters the market first, and charges the monopoly price p M 1 = c 1. In Case A this would lead to equilibrium with p 2 > p M 1. But in Case B firm 2 can profitably undercut and charge, for instance, p 2 = 1 2 (c 2 + p M 1 ). So there is no monopoly equilibrium. In case B the only possible equilibrium price pairs (p 1, p 2 ) would satisfy p 2 [c 2, c 1) (c 1, c 1). But then BR 1 (p 2 ) =, so there can be no equilibrium.

34 EC202, University of Warwick, Term 2 34 of 34 Summary 1. A monopoly firm typically has too small an output relative to the perfectly competitive ideal. Correcting this distortion would require a subsidy, not a tax. This subsidy can be paid out of the firm s monopoly profits. 2. When there is imperfect competition, one case occurs when firms each choose their output as best responses to the other firms output choices. This is the Cournot model of quantity competition. 3. A second case of imperfect competition occurs when firms each choose their price as best responses to the other firms price choices. This is the Bertrand model of price competition. Sometimes it leads to a monopoly outcome; sometimes to a perfectly competitive outcome; and sometimes there is no equilibrium at all.

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