(8) For each situation, solve whether collusion is sustainable using "trigger strategy" (infinitely repeated) NOTE: For each of these exercises, you need to calculate { collusion cheat p punished} and see if the incentive compatibility inequality (condition for collusion to occur as a Nash equilibrium) is satisfied. 8a) Stage Game is Bertrand with Homogeneous Product; cost same as before but overall demand is O(P)-375-15 P and given 8-09
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- (5) For each situation, solve for the Bertrand-Nash Equilibrium (differentiated Product). 5a) Suppose Sarah's constant marginal cost is $5 but Joe's is $8 Recall that in a Bertrand model with differentiated product, each supplier faces his/her own demand: Qjoe = 100 – 10 Pjoe + 5 Psarah Qsarah = 100 – 10 Psarah + 5 Pjoe 5b) Suppose Joe and Sarah have the same cost functions as earlier (constant MC of $5) but asymmetric demand functions Qjoe = 100 – 10 Pjoe + 5 Psarah Qsarah = 160 - 10 Psarah + 5 Pjoe1. The market (inverse) demand function for a homogeneous good is P(Q) = 10 - Q. There are two firms: firm 1 has a constant marginal cost of 2 for producing each unit of the good, and firm 2 has a constant marginal cost of 1. The two firms compete by setting their quantities of production, and the price of the good is determined by the market demand function given the total quantity. a. Calculate the Nash equilibrium in this game and the corresponding market price when firms simultaneously choose quantities. b. Now suppose firml moves earlier than firm 2 and firm 2 observes firm 1 quantity choice before choosing its quantity find optimal choices of firm 1 and firm 2.(8) For each situation, solve whether collusion is sustainable using "trigger strategy" (infinitely repeated) 7 punished cheat> and see if the incentive compatibility inequality (condition for collusion to occur as a Nash equilibrium) is satisfied. 8a) Stage Game is Bertrand with Homogeneous Product; cost same as before but overall demand is Q(P) = 375 - 15 P and given 8 = 0.9 8b) Same as 4a) but given & = 0.5 8c) Stage Game is Cournot; Joe and Sarah have a constant MC P(Q) = 20 – 0.1 × Q where Q = Qjoe + Qsarah and given 8 =0.9 8d) Same as 4c) above but given 8 = = 0.5 8e) Try 4c) and 4d) assuming Sarah's MC = $5 but Joe's MC = $8. They both collude on Sarah's Monopoly Output.
- Problem 3. Consider the following game with three firms. First, firms 1 and 2 si- multancously choose quantities q1 and q2 respectively. After observing firm 1 and 2's quantities, firm 3 chooses its quantity q3. There is no production cost and the inverse demand function is p= 12 – (91 +2 + 93). (a) Compute the SPNE of this game. (b) Give an example of Nash equilibrium s* with s = 4 and s, = 6 , that is not subgame perfect. game theory questionSuppose Tasty Cakes is deciding its pricing strategy: it is debating whether to offer a single linear price for its sheet cakes or to offer non-linear pricing. Suppose on any day, it gets 2 customers–who are of Type A and TypeB with the following maximum willingness-to-pay for the cakes: Units Type A Type B 1 $100 $90 2 $75 $40 Suppose it costs $10 to bake each of the cakes. (a) If Tasty Cakes decides to pick a linear pricing strategy, what will be the profit-maximizing price it should choose? How many cakes will it end up selling and what will be its total profit? (b) If Tasty Cakes decides to pick a non-linear pricing strategy where it may offer a different price depending on the number of cakes purchased, what should be the profit-maximizing set of prices? How many cakes will it sell and what will be its total profit? (c)Comparing Tasty Cakes’profits in (a) and (b), explain IN WORDS why we see this difference in profitsTwo takeaway restaurants, ChipAhoy and FishDish, compete for business in a small seaside town. The manager of ChipAhoy has engaged you to advise on the pricing of its main offering, a fish & chips supper. Your intention is to analyse the situation as a twoplayer competitive game. After making background investigations, you have decided to adopt the following assumptions in your analysis. A1 The cost of the producing and serving a portion of fish & chips is the same for both restaurants: £3.50.A2 In a typical week, holidaymakers buy a total of 1500 portions of fish & chips, and local residents buy 1000 portions.A3 Local residents always choose the restaurant with the lower price. If prices are the same at the two restaurants, their custom is divided equally between the two. A4 Holidaymakers divide their custom 50:50 between the two restaurants, irrespective of the prices. Derive the Nash equilibrium/equilibria for the game
- (f) Does GaterTools have a dominant strategy? Explain using numbers from the payoff matrix.(g) Identify the Nash equilibrium. Explain why this is a Nash equilibrium using information from the payoff matrix.(h) Suppose HandyBilt makes a credible commitment to GaterTools that if GaterTools maintains its price, then HandyBiltwill pay GaterTools $250. Will this offer result in a Nash equilibrium with different strategies from those identified in part(g) ? Explain using numbers from the payoff matrix.There are two firms in the market (duopoly). These two firms are competingsimultaneously. The first firm chooses its output level (x) by predicting the second firm’soutput (y). Let c denote the total cost function c(x) = x and c(y) = y. Also, let’s assumethat the inverse demand function is p(Y) = 7 - Y where Y = x + y. (1) Obtain the reactionfunction of the first firm. (2) Find the equilibrium (output and profit of each firm) whentwo firms simultaneously competeTwo firms are competing in a Bertrand setting. The demand and costs equations are: Q1 = 88–4P1+2P2, Q2 = 88–4P2+2P1; MC1 = 9; and MC2 = 10. Instructions: Use no decimals. Do not round values if used for other calculations. d. Profits Firm 1 = $ and profits Firm 2 = $ e. If Firm 1 instead produces P1 = 16, the optimal P2 = . f. When one of the firms set a P < P-Duopoly, the best strategy for the other firm is to set: A. a P-BRF, and continue with this strategy afterward with the risk of economic profits = 0. B. a P-BRF, and after this one time, then continue with P-Duopoly. C. a P > P-Duopoly from now on, until the market reaches P-Monopoly. D. also P < P-Duopoly one time, then set P-Monopoly.
- (a) Assuming that each fishery chooses fi ∈ (0,F), to maximize its payoff function, derive the players’ best response functions and find a Nash equilibrium. (b) Is the equilibrium you found in (a) unique or not? What are equilibrium payoffs? (c) Suppose that a benevolent social planner wants maximize the util- ity of both fisheries. In other words, the social planner solves the following problem: max w(f1, f2) = u1(f1, f2) + u2(f1, f2) (f1 ,f2 )= 2ln(f1)+2ln(f2)+2ln(F −f1 −f2). Find the social planner’s solution. (d) What are the fisheries’ payoffs if the quantities of fish they catch are solutions to the social planner’s problem? What can you say about the Nash equilibrium quantities of fish being caught as compared to the social planner’s solution? (e) If fishery j decides to follow the recommendation of the social planner, how much fish will firm i catch?The marginal cost of a product is fixed at MC = 20. The demand for the product is Q = 100 - 2P. (a) Now consider a Cournot model with two firms that are choosing quantities simultaneously. What is the best reply (best response) function for each firm? What is theNash equilibrium? What is the total surplus? (b)What do you expect the total surplus would be with three firms? Why? (You do not need to calculate an exact value. You can say ”total surplus is at least 100”, or ”total surplus is at most 80”)Two firms produce the samecommodity, both with zero cost. The demand for this commodity is D(P) = 100−P.The two firms can each produce at most 50 units. They compete on price andrationing is efficient: if pi < pj then the demand that j faces is Dj(p) = D(pj) − qi,where qi is the quantity supplied by firm i. That is, the lower price firm gets to sellfirst. Is the price list p = (p1, p2) = (0, 0) a Nash equilibrium? Prove your assertion.