# Lecture 4: Nash equilibrium in economics: monopolies and duopolies

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1 Lecture : Nash equilibrium in economics: monopolies and duopolies We discuss here an application of Nash equilibrium in economics, the Cournot s duopoly model. This is a very classical problem which in fact predates modern game theory by more than a century. Supply and demand: Imagine a number of companies which produce some item and sell it on the same market. The law of supply and demand is that the price of the product should decrease as the supply increases. We will use a simple equation to model this. P is the price of a single item. Q is the aggregate amount of items produced. We assume that the price P at production level Q is given by P Q = { P 1 Q/ if Q if Q 1 The constant P is the highest possible price and the constant is the highest production level determined by the size of the market. Monopoly: As a warm-up let us imagine there is only one company serving the market. The company wants to maximize its profit. The profit, Π, is given by Π = Q[P c] = Production level profit for each item where the constant c is the marginal cost, that is the price for the company to produce an item. Using the equation 1 we have ΠQ = QP 1 Q cq. To find the maximum we differentiate with respect to Q and find that the critical points are given by the solution of the equation with solution = dπq dq = P c P Q Q = 1 cp. Note that Q is a maximum since the second derivative d ΠQ dq = P <. 1

2 To maximize its profit the company will choose the production level Q. The corresponding price is 1 c and the corresponding profit is So we obtain Q = P = P Q = P 1 Π = Q [P c] = 1 cp = P P = P + c 1 c P + c P Monopoly, P = P + c c 1 c P, Π = P 1 cp Cartel: Suppose two companies R and C put the same product on the market. If they work as a cartel they will simply split the market in two and take half of it each. The price level will be unchanged and we have Cartel Q R = Q C = 1 cp P = P + c, ΠR = Π C = P 8 1 cp Duopoly: To analyze a duopoly situation where two companies compete for the market, we realize that the competitive situation is nothing but a -player game. The players are the companies R and C.

3 The strategies are, for both companies, R and C, to choose some production levels Q R and Q C. The payoffs Π R and Π C for R and C respectively are obtained by noting that the price P now depends on the aggregate production level Q = Q R + Q C : Π R Q R, Q C = Q R P 1 Q R + Q C cq R Q Π C Q R, Q C = Q C P 1 Q R + Q C cq C Recall that Q R, QC is a Nash equilibrium if Q R is a best response to Q C and Q C to Q R. To find these value we first pick an arbitrary Q C and compute the best response Q R to Q C, that is we maximize the payoff Π R Q R, Q C with respect to Q R. The best response is obtained by solving and one finds = Π RQ R, Q C Q R = P c P Q C P Q R, Q R = 1 cp Q C. By symmetry the best response Q C to Q R is given by Q C = Q 1 cp Q R If Q R and Q C are best responses to each other then they must satisfy the equations Q R = Q 1 cp Q C Q C = 1 cp Q R This is easy to solve and one finds the solution Q R = Q C = Q 1 cp. The corresponding price is P = P Q R + Q C = P 1 1 c P = 1 P + c

4 and the corresponding optimal payoffs are Π R = Q [ ] R P c = Q 1 cp 1 P + c c = P 9 1 c P 5 and the by symmetry the same solution for Q C. To summarize in a situation of duopoly where two firms compete for the market the analysis in terms of game theory gives the result Duopoly Q R = Q C = 1 cp P = 1 P + c, ΠR = Π C = P 9 1 cp Monopoly or Cartel vs Duopoly: By comparing the results we find that Compared to a monopoly, in a duopoly the price is lower P < P and the production level is higher Q > Q, reflecting the availability of the products to a greater number of people. Since the production is higher in principle a greater number of people are employed to build the product. The aggregate profit for the companies is lower in a duopoly than in a monopoly. As expected our model shows that competiton benefits the customers but diminishes the profits of the companies. Exercise 1: Consider an asymetric version of the Cournot duopoly game where the marginal cost for firm 1 is c 1 and the marginal cost for firm is c. 1. If < c i < 1 P what is the Nash equilibrium?. if c 1 < c < P but c > P + c 1, what is the Nash equilibrium Exercise : Cournot model for m firms. Suppose m firms produce the quantities Q 1, Q,, Q m of the same product on the same market. The market price is given by P Q = P 1 Q/ with Q = Q Q m, c is the marginal cost of producing one item and the profit for firm i is given by Π i Q 1,, Q M = Q i [P Q cq i ].

5 1. Generalizing the case of two firms, explain how to obtain the Nash equilibrium for this model.. Find the symmetric Nash equilibria, i.e. the Nash equilibria with Q 1 = = Q m. Hint: To avoid long computation assume from the start that the Nash equilibrium is symmetric. The best response equations will then reduce to solving one single equation rather than a system of m equations.. Compute the price and profits in the symmetric Nash equilibrium. What happens for large m?. 5

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