# Principles of Microeconomics Review D22-D29 Xingze Wang, Ying Hsuan Lin, and Frederick Jao (2007)

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1 Principles of Microeconomics Review D-D Xingze Wang, Ying Hsuan Lin, and Frederick Jao (). Principles of Microeconomics, Fall Chia-Hui Chen November, Lecture Monopoly Outline. Chap : Monopoly. Chap : Shift in Demand and Effect of Tax Monopoly The monopolist is the single supply-side of the market and has complete control over the amount offered for sale; the monopolist controls price but must operate along consumer demand.. Revenue in Monopoly Review the revenue in perfect competition: Revenue of monopolist is also R = P (.) AR = MR = P. (.) R = P (), but P changes with because the monopolist faces the whole market demand and his quantity supplied affects the market price. Then the average revenue is and the marginal revenue is R AR = = P (); dr d(p ) dp MR = = = P () +. d d d The relation between P and is determined by the demand curve (see Figure ). Since dp <, d MR < P (). Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

2 . Output Decision in Monopoly Example (A Demand Function). Suppose the price is P = D, where D is the quantity demanded. Calculate the average revenue and the marginal revenue: AR = P = ; dp MR = p + =. d Demand Curve P P Figure : Demand and Supply of Monopolist.. Output Decision in Monopoly The monopolist will maximize its profit π() = R() C(), which is the difference of revenue and cost. When maximized, namely, dπ dr dc = =, d d d MR =, so the monopolist would choose this point to produce; because P > MR, Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

3 The profit equals to (see Figure ). P >. (AR AC) = (P AC) P P* AR Demand Curve AC * MR Figure : Output Decision of Monopolist.. Lerner s Index Rewrite the marginal revenue: dp dp MR = P + = P + P ( ) = P + P. d P d E D The monopolist chooses to produce the quantity where Thus, = MR = P + P. E D P =, (.) E D P which is the makeup over as a percentage of price; this fraction is less than. L = P P measures the monopoly power of a firm and is called Lerner s index. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

4 In a competitive market, and the makeup is zero. = P, In a monopolistic market, Comments: and the makeup is larger than zero. < P,. The makeup increases with the inverse of demand elasticity.. The larger the demand elasticity, the less profitable it is to be a monopolist (see Figure and ).. A monopolist never produces a quantity at the inelastic portion of demand curve, since the makeup right hand side of Equation. is less than one. P* D MR * Figure : Inelastic Demand. Shift in Demand and Effect of Tax Compare the competitive market and the monopolistic markets. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

5 P* MR D P * Figure : Elastic Demand.. Supply Curve of Competitive Market and Monopolistic Markets The supply curve in competitive markets is determined by, and there is no supply curve for monopolistic markets.. Shift in Demand In competitive markets, when demand shifts, the changes in price and quantity has a positive relation, namely, if the price raises, the quantity increases. In monopolistic markets, when the demand shifts, it may be the case that only price changes (see Figure ), only quantity changes (see Figure ), or both change.. Effect of Tax In competitive marketes, buyer s prices raise less than the tax, and the burden is shared by Producers and Consumers; in monopolistic markets, the price might raise more than tax (see Figure ). Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

6 MR AR P P P MR AR = Figure : Only Price Change in Monopoly. AR MR P P =P MR AR Figure : Only uantity Change in Monopoly. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

7 P P MR D = +T P Figure : Price Might Raise More than Tax. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

8 . Principles of Microeconomics, Fall Chia-Hui Chen November, Lecture Monopoly and Monopsony Outline. Chap : Multi-Plant Firm. Chap : Social Cost of Monopoly Power. Chap : Price Regulation. Chap : Monopsony Multi-Plant Firm How does a monopolist allocate production between plants? Suppose the firm produces quantity with cost C ( ) for plant, and quantity with cost C ( ) for plant. The total quantity is And the profit is T = +. π = T P ( T ) C ( ) C ( ) = ( + )P ( + ) C ( ) C ( ). To solve, use the first order constraint: Since Similarly, Thus, dπ dp ( + ) dc = P ( + ) + ( + ) =, d d d dp ( T ) dp ( T ) P ( T ) + T = P ( T ) + T = MR( T ), d d T MR( T ) = ( ). MR( T ) = ( ). MR( T ) = ( ) = ( ). Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

9 Social Cost of Monopoly Power Firstly, compare the producer and consumer surplus in a competitive market and a monopolistic market. In the competitive market, the quantity is determined by = AR, while in the monopolistic market, the quantity is determined by = MR (see Figure ). Therefore, in going from a perfectly competitive market to a P P M P C A MR B C MR D=AR M C Figure : Consumer and Producer Surplus in Monopolist Market. monopolistic market, the change of consumer surplus and producer surplus are, respectively, CS = (A + B), and The deadweight loss is P S = A C. DW L = B + C. In fact, social cost should not only include the deadweight loss but also rent seeking. The firm might spend to gain monopoly power by lobbying the government and building excess capacity to threaten opponents. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

10 Price Regulation In perfectly competitive markets, price regulation causes deadweight loss, but in monopoly, price regulation might improve efficiently. Now we discuss four possible price regulations in monopolistic markets. P, P, P, P are: P (P C, P M ); P = P C ; P (P, P C ); P < P. PPM P C P MR M C AC D=AR Figure : Comparing Competitive and Monopolist Market. Price between the competitive market price and monopolist market price. Suppose the price ceiling is P. The new corresponding AR and MR curves are shown in Figure. Given the new MR curve, the equilibrium quantity will be. ( M, C ). Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

11 PPM P P C MR M C AR Figure : Price between the Competitive Market Price and Monopolist Market Price. Price equal to the competitive market price. The new corresponding M R and AR curves are shown in Figure. In this case the equlibrium price and quantity are as same as those of the competitive market. Price between the competitive market price and the lowest average cost. Suppose the price ceiling is P. The new corresponding MR and AR curves are shown in Figure. The equilibrium quantity will be. ( C, ). The new bold line describes the relation between price and quantity. Price lower than the lowest average cost. The firm s revenue is not enough for the cost, thus it will quit the market. There is no production. The analysis shows that if the government sets the price ceiling equal to P, the outcome is the same as in a competitive market, and there is no deadweight loss. Natural monopoly. In a natural monopoly, a firm can produce the entire output of the industry and the cost is lower than what it would be if there were other firms. Natural monopoly arises when there are large economies of scale (see Figure ). If the market is unregulated, the price will be P M and the quantity will be M. To improve efficiency, the government can regulate the price. If the price is regulated to be P C, the firm cannot cover the average cost and will go out of business. P R is the lowest price that the government can set so that the monopolist will stay in the market. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

12 P P C MR C AR Figure : Price Equal to the Competitive Market Price. P P P C P AC MR C AR Figure : Price between the Competitive Market Price and the lowest Average Cost. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

13 P P M P R P C MR M R AC C AR Figure : Regulating the Price of a Natural Monopoly. Monopsony Monopsony refers to a market with only one buyer. In this market, the buyer will maximize its profit, which is the difference of value and expenditure: When the profit is maximized, Thus max Π() = V () E(). d (V () E() =. d MV = ME, namely, the marginal value (additional benefit form buying one more unit of goods) is equal to the marginal expenditure (addtional cost of buying one more unit of goods). Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

14 . Principles of Microeconomics, Fall Chia-Hui Chen November, Lecture Monopoly and Monopsony Outline. Chap : Monopsony. Chap : Monopoly Power. Chap : Price Discrimination Monopsony A monopsony is a market in which there is a single buyer. Typically, a monopsonist chooses to maximize the total value derived from buying the goods minus the total expenditure on the goods: V () E(). Marginal value is the additional benefit derived from purchasing one more unit of a good; since the demand curve shows the buyer s additional willingness to pay for an additional unit, marginal value and the demand curve coincide. Marginal expenditure is the additional cost of buying one more unit of a good. Average expenditure is the market price paid for each unit, which is determined by the market supply (see Figure ). Now compare the competitive and monopsony market. Competitive buying firms are price takers: The price P is fixed; therefore, E = P. And then (see Figure ). Monopsonist: By definition, and AE = ME = P E = P S (). E AE = = P S (); de dp S () ME = = P S () +. d d Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

15 ME S=AE Price P C P M B A C D=MV M C uantity Figure : Monopsony Market. Since the supply curve is upward sloping, ME > P S () = AE. To maximize we have V () E(), MV () = ME(). Buyers gain A B from monopsony power, while sellers lose A+C (see Figure ); the deadweight loss is B + C. Monopoly Power There usually is more than one firm in the market, and they have similar but different goods. The Lerner s index is P L = =, P E d in which E d is the elasticity of demand for a firm, as oppose to market demand elasticity. There are several factors that affect monopoly power. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

16 S Price P C D C uantity Figure : Competitive Buying Market. Elasticity of Market Demand: If the market demand is more elastic, the firm s demand is also more elastic. In a competitive market, elasticity of demand for a firm is infinite. With more than one firm, a single firm s demand is more elastic than market demand. Number of Firms in Market: With more firms, the firm s demand elasticity is higher, namely, the market power is less. Interaction among Firms: If competitors are more aggressive, firms have less market power; if firms collude, they thus have more market power. Price Discrimination Without market power, the producer would focus on managing production; with market power, the producer not only manages production, but also sets price to capture consumer surplus. First Degree Price Discrimination Knowing each consumer s identity and willingness to pay, the producer charges a separate price to each customer. MR() = P D (). Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

17 D=AR MR Figure : First Degree Price Discrimination. Choose such that is efficient. MR( ) = ( ) When the consumer surplus is zero, the producer surplus is maximized. This kind of price discrimination is not usually encountered in real world. Second Degree Price Discrimination The producer charges different unit prices for different quantity purchased. It applies to the situation when consumers are heterogeneous and the seller cannot tell their identity, and consumers have multiple unit demand. Third Degree Price Discrimination Refer to next lecture. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

18 Third Degree Price Discrimination. Principles of Microeconomics, Fall Chia-Hui Chen November, Lecture Pricing with Market Power Outline. Chap : Third Degree Price Discrimination. Chap : Peak-Load Pricing. Chap : Two-Part Tariff Third Degree Price Discrimination Third degree price discrimination is the practice of dividing consumers into two or more groups with separate demand curves and charging different prices to each group (see Figure ). Now maximize the profit: Price P Price Price P MR D D MR( T ) T uantity uantity uantity (a) Group. (b) Group. (c) Total Market. Figure : Third Degree Price Discrimination. π(, ) = P ( ) + P ( ) C( + ); first order conditions and give π = π = MR ( ) = ( + ), Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

19 Peak-Load Pricing and finally, Because and we have since MR ( ) = ( + ); MR ( ) = MR ( ) = ( + ). MR = P ( ), E MR = P ( ), E P / E = ; P / E E < E, P > P. Sometimes a small group might not be served (see Figure ). The producer only ( T ) Price Price P Price MR D uantity MR D T MR( T ) uantity (a) Group. (b) Group. (c) Total Market. Figure : Third Degree Price Discrimination with a Small Group. serves the second group, because the willingness to pay of the first group is too low. Peak-Load Pricing Producers charge higher prices during peak periods when capacity constraints cause higher. Example (Movie Ticket). Movie ticket is more expensive in the evenings. Example (Electricity). Price is higher during summer afternoons. For each time period, (see Figure ). = MR Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

20 Price Price P M P L MR D MR D L uantity M uantity (a) Period. (b) Period. Two-Part Tariff Figure : Peak-Load Pricing. The consumers are charged both an entry (T ) and usage (P ) fee, that is to say, a fee is charged upfront for right to use/buy the product, and an additional fee is charged for each unit that the consumer wishes to consume. Assume that the firm knows consumer s demand and sets same price for each unit purchased. Example (Telephone Service, Amusement Park.). When there is only one consumer. If the firm sets usage fee P =, consumer consumes units (see Figure ), and the firm can set entry fee and extract all the consumer surplus. T = A, If setting total revenue is and cost is then the profit is If setting total revenue is P >, R = A + P, C =, π = A B. P <, R = A + P, Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

21 Price CS A D * uantity Figure : Entry Fee of One Consumer. Price CS A P B D * uantity Price CS A P * B D uantity (a) Price Higher than Marginal Cost. (b) Price Lower than Marginal Cost. Figure : Two-Part Tariff. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

22 and cost is then the profit is C =, π = A B. Either B or B is positive, so the best unit price that maximized the producer surplus is exactly. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

23 . Principles of Microeconomics, Fall Chia-Hui Chen November, Lecture Pricing and Monopolistic Competition Outline. Chap : Two-Part Tariff. Chap : Bundling. Chap : Monopolistic Competition Two-Part Tariff When there are two consumers. Consumer has higher demand than consumer. If setting P =, consumer consumes units and consumer consumer units. A is consumer s consumer surplus, and A is consumer s consumer surplus. Assume that A > A. Then the maximum entry fee the firm can charge is A. If more than A is charged, consumer would not consume. A Price A D uantity D Figure : Entry Fee of Two Consumers. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

24 Now consider the case that price is higher or lower than the marginal cost. If setting we have and thus Because (see Figure ), If setting we have and thus Always P >, T = A, π = A + (P ) = A + C, π = A + (P ) = A B, π = π + π = A + C B. C > B π > A. P <, T = A π = A ( P ) = A D, π = A ( P ) = A E, π = π + π = A D E. π < A. Summary: the firm should set usage fee P >, namely, larger than the marginal cost; entry fee T = A, namely, equal to the remaining consumer surplus of the consumer with the smaller demand. Summary: If the demands of two consumers are more similar, the firm should set usage fee close to and higher entry fee; if the demands of two consumers are less similar, the firm should set higher usage fee and lower entry fee. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

25 A Price A P B C uantity Figure : Two-Part Tariff: Price Higher than Marginal Cost Price A A D E F P uantity Figure : Two-Part Tariff: Price Lower than Marginal Cost Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

26 Bundling Bundling means packaging two or more products, for example, vacation travel usually has a packaging of hotel, airfare, car rental, etc. Assume there are two goods and many consumers in the market, and the consumers have different reservation prices (willingness to pay). See Figure and. The coordinates are the reservation prices of the two goods respectively. If the firm sells the goods separately with prices P and P (see Figure ), when and r > P, r > P, the consumer will buy both good and ; when but the consumer will only buy good ; when but the consumer will only buy good ; when and r > P, r < P, r > P, r < P, r < P <, r < P <, the consumer will buy neither good nor. If the firm sells the two goods in a bundle and charges price P B, if if the consumer will buy the bundle; r + r > P B, r + r < P B, the consumer will not buy the bundle. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

27 r r Figure : Price without Packaging. r r Figure : Price with Packaging. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

28 r.. (,) (,). (,) (,). r Figure : Bundling Example. Bundling Example : the four points in Figure represent the four consumers reservation values. Consider two pricing strategies one is that the two goods are sold separately with prices P = and P =, and the other is that the two goods are sold in a bundle with price P B =. Without bundling, the revenue is R =, and with bundling, the revenue is R = ; bundling does not do better. Bundling Example : Consider the other four consumers shown in Figure and the firm chooses between the two pricing strategies mentioned before. Without bundling, the revenue is R =, and with bundling, the revenue is R = ; obviously, bundling strategy benefits the producer in this case Conclusion: bundling works well when the consumers are heterogeneous; price discrimination is not possible; the demand for different goods are negatively correlated. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

29 r. (,). (,). (,). (,) r Figure : Bundling Example. Monopolistic Competition In monopolistic competition, Thus there are many firms; there is free entry and exit; products are differentiated but close substitutes. each firm faces a distinct demand, which is downward sloping and elastic; there is no profit in long run (see Figure and ); price is higher than marginal cost because firms have some monopoly power, and thus there is some deadweight loss. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

30 P P S PROFIT AC S MR S D =AR S Figure : Short Run in Monopolistic Competition Market. P AC P L L MR L D L =AR Figure : Long Run in Monopolistic Competition Market. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

31 . Principles of Microeconomics, Fall Chia-Hui Chen November, Lecture Game Theory and Oligopoly Outline. Chap, : Game Theory. Chap, : Oligopoly Game Theory In monopolistic competition market, there are many sellers, and the sellers do not consider their opponents strategies; nonetheless, in oligopoly market, there are a few sellers, and the sellers must consider their opponents strategies. The tool to analyze the strategies is game theory. Game theory includes the discussion of noncooperative game and cooperative game. The former refers to a game in which negotiation and enforcement of binding contracts between players is not possible; the latter refers to a game in which players negotiate binding contracts that allow them to plan joint strategies. A game consists of players, strategies, and payoffs. Now assume that in a game, there are two players, firm A and firm B; their strategies are whether to advertise or not; consequently, their payoffs can be written as π A (A s strategy, B s strategy) and π B (A s strategy, B s strategy) respectively. Now let s represent the game with a matrix (see Table ). The first row is the situation that A advertises, and the second row is the situation that A does not advertise; the first column is the situation that B advertises, and the second column is the situation that B does not advertise. The cells provide the payoffs under each situation. The first number in a cell is firm A s payoff, and the second number is firm B s payoff. Dominant strategy is the optimal strategy no matter what the opponent does. If we change the element (, ) to (, ), no matter what the other firm does, advertising is always better for firm A (and firm B). Therefore, both firms have a dominant strategy. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

33 . Cournot Model Example. Market has demand with two firms, so P =, = +, and assume that there is no fixed cost and marginal cost, = =. Firm would like to maximize its profit or from the P, ( ) ; d (( ) ) =, d we have firm s reaction function =, in which the is the estimation of firm s production by firm. In the same way, firm s reaction function is =, in which the is the expectation of firm s production by firm. At equilibrium, firm and firm have correct expectation about the other s production, that is, =, Thus, at equilibrium, and =. =, =. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

34 . Principles of Microeconomics, Fall Chia-Hui Chen November, Lecture Oligopoly Outline. Chap, : Stackelberg. Chap, : Bertrand. Chap, : Prisoner s Dilemma In the discussion that follows, all of the games are played only once. and Stackelberg Stackelberg model is an oligopoly model in which firms choose quantities sequentially. Now change the example discussed in last lecture as follows: if firm produces crispy and firm produces sweet, the payoff is (, ); if firm produces sweet and firm produces crispy, the payoff is (, ) (see Table ). Firm Crispy Sweet Firm Crispy Sweet -,-,, -,- Table : Payoffs of Firm and. (,, ),, This is an extensive form game; we use a tree structure to describe it. Crispy Firm Sweet Firm Crispy Sweet Firm Crispy Sweet (-,-) (,) (,) (-,-) Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

35 Start from the bottom using backward induction, namely, solve firm s decision problem first, and then firm s. If firm chooses crispy, firm will choose sweet to get a higher payoff. If firm chooses sweet, firm will choose crispy. Knowing this, firm will choose sweet in the first place. In this case, going first gives firm the advantage. Now consider the case we discussed for the Cournot model, but firm chooses first, and firm choose later. For firm, the first order condition gives that For firm, gives that Thus, the result will be d d ( ) = ( ) =. d d ( ( ) = =. =, π =.; =., π =.. In this case, firm also has advantage to go first. Bertrand The Bertrand model is the oligopoly model in which firms compete in price. First assume that two firms produce homogeneous goods and choose the prices simultaneously. Assume two firms have the same marginal cost = = ; consumers buy goods from the firm with lower price. If P = P =, the two firms share the market equally, but this is not the equilibrium. The reason is that one firm can get whole demand by lowering the price a little; therefore, the equilibrium will be P = P =, Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

36 when the price is equal to the marginal cost. Now we check if is the best choice for firm given When if P = P =. P =, π = ; P >, consumers will not buy firm s goods, thus if π = ; P <, the price is lower than the marginal cost, thus It follows that π <. P = is optimal for firm ; by analogy, we can get the same conclusion for firm. Therefore, P = P = = in a Bertrand game with homogeneous goods. This is like the competitive market. Suppose the goods from the two firms are heterogeneous, but substitutes. Firm and firm face the following demands: and = P + P, = P + P. Firm s and firm s reaction functions are and P P = +, P P = +. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

37 At equilibrium, and so and P = P, P = P ; P = P =, = =, π = π =. Consider the case when the firms choose prices sequentially. Supposing firm s first order condition d ( P + P ) P = d and firm s first order condition d ( P + P (P )) P =. d From the first equation P P (P ) = +, and then substitute it into the second equation, we obtain P =. Therefore, π = ; P =, and π =. In this case, we can see that the firm who goes first has disadvantage, when competing in price. Prisoner s Dilemma Criminals A and B cooperated, and then got caught. However, the police have no evidence; so they have to interrogate A and B separately, trying to make them tell the truth. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

38 Firm A Firm B Betray Silent Betray -,-, Silent -, -,- Table : Payoffs of Firm A and B. The above matrix shows A and B s payoffs. Given the payoffs, A and B choose to tell the truth (betray) or keep silent. We can see that, if they both keep silence, the result (, ) is best for them; nonetheless, if one of them betrays another, he will be free but his companion will have payoff -; moreover, if both of them betray, they will face the result (, ). Consider what A thinks. Whether B keeps silence or betrays him, A will always be better off if he betrays; so will B. Therefore, the result of this problem is (, ), namely, both prisoners betray. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

39 . Principles of Microeconomics, Fall Chia-Hui Chen November, Lecture Strategic Games Outline. Chap, : Collusion Prisoners Dilemma. Chap, : Repeated Games. Chap, : Threat, Credibility, Commitment. Chap : Maximin Strategy Collusion Prisoners Dilemma Last time we talked about the prisoners dilemma. The conclusion is that they will betray the other. Now apply it to the cases of Cournot and Bertrand models. In the Cournot model, the demand is The equilibrium will be with P =. = =, π = π =. However, to maximize their total profits, they should choose a total quantity so that d (( )) =, d which follows that If they share profit equally, =. = =., and π = π =.. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

40 ( ) ( ) Figure : Reaction Curves in Cournot Model. Obviously, the latter case will make both of them better off. But given the opponent produces., each of them can increase the profit by producing more (see Figure ). In Bertrand model, demand functions for firm and firm are and Equilibrium is with = P + P, = P + P. P = P =, π = π =. However, firms can choose P and P together to maximize the total revenue π = P ( P + P ) + P ( P + P ). By first order condition, we obtain P + P =, and P + P =. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

41 Thus with P = P =, π = π =. But in this case, each firm has incentive to lower its price given the other firm s price (see Figure ). P (P ) P (P ) Figure : Reaction Curves in Bertrand Model. Repeated Games Back to the prisoners problem. If suspect A and B will cooperate for infinite periods, and they are both patient, they care about future payoffs. Because if one of them betrays this time, the opponent will lose the trust and betray in the future; the payoff changes from to for each time. Therefore, both A and B would like to keep silence. But if they are impatient, and only consider today s payoff, they will still betray. Now move on to the case that A and B will cooperate for finite number times which is fairly large. We deduce from the last time they cooperate; the answer is that they will betray for the last time, so will they for other opportunities. Therefore, the collusion between A and B succeed only if they will be cooperative forever and are patient. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

42 Threat, Credibility, Commitment Back to the crispy-sweet question. Firm Firm Crispy Sweet Crispy -,-, Sweet, -,- Table : Payoffs of Firm and. Crispy Firm Sweet Firm Firm Crispy Sweet Crispy Sweet (-,-) (,) (,) (-,-) In order to get the largest by producing sweet, firm tries to make firm believe that firm should choose crispy by claiming that it always produces sweet no matter what firm produces. However, firm can ignore firm s announcement because once firm choose sweet, firm will produce crispy. Suppose that firm will advertise and so change the payoffs. Firm Firm Crispy Sweet Crispy -,-, Sweet, -, Table : Payoffs of Firm and. Crispy Firm Sweet Firm Firm Crispy Sweet Crispy Sweet (-,-) (,) (,) (-,) In this case, firm feels indifferent between choosing crispy or sweet when firm produces sweet, and chooses sweet when firm produces crispy. So it is credible if firm claims that it always chooses sweet, and then firm had better choose crispy. This example tells us that firm had to do something to make the announcement credible. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

43 Maximin Strategy See Table. Firm B has dominant strategy: advertise. Therefore, the equilibrium should be both A and B advertise. However, if firm B does not choose the rational option, the minimum payoff of A is if A advertises, and if A does not advertise. The maximin strategy is the strategy that renders the highest minimum payoff. When A cannot tell whether B is rational or not, A might use maximin strategy. In this case, the maximin strategy of A is: Firm A Firm B Advertise Not Advertise Advertise,, Not Advertise,, Table : Payoffs of Firm A and B. Cite as: Chia-Hui Chen, course materials for. Principles of Microeconomics, Fall. MIT Source URL: Saylor URL: Page of

### Monopoly and Monopsony

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