Consider a modification of the Rock-Paper-Scissors game in which P2 is an expert in body language tells. In particular, assume that P2 can tell whether P1 is about to play R or not. At the same time, P2 cannot tell whether P1 is about to play P or S. In other words, P2 can partially observe P1's choice.
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- Exercise 3. Consider the following game in normal form. L R U 4, 4 1, 6 D 6, 1-3, –3 (a) Find all the Nash equilibria of this game. (b) Show that the following probability measure is a correlated equilibrium of this game. L R 1 1 U (c) Show that the following probability measure is a correlated equilibrium of this game. L R D (d) Plot the payoff profile of cach equilibrium in (a)-(c) above. Are the payoff profiles in (b) and (c) inside or outside the convex hull of NE payoffs?. Consider the 2-player, zero-sum game "Rock, Paper, Scissors". Each player chooses one of 3 strategies: rock, paper, or scissors. Then, both players reveal their choices. The outcome is determined as follows. If both players choose the same strategy, neither player wins or loses anything. Otherwise: • "paper covers rock": if one player chooses paper and the other chooses rock, the player who chose paper wins and is paid 1 by the other player. • "scissors cut paper": if one player chooses scissors and the other chooses paper, the player who chose scissors wins and is paid 1 by the other player. • "rock breaks scissors": if one player chooses rock and the other player chooses scissors, the player who chose rock wins and is paid 1 by the other player.4. David plays in a game where his strategy (set of possible choices) is denoted by x, which can be any integer between 1 and 7, against Goliath, whose strategy is denoted by y, which can be any integer between 1 and 7. David's and Goliath's utility functions are the same and given by: U(x, y) = (x-2)(y-2). Based on this information, determine whether each of the following statements are true or false. (a) The combination (x, y) = (2, 2) is a Nash equilibrium. (b) This game has no dominant strategy (a choice of integer that gives the highest payoff regardless of what the opponent chooses). (c) This game has only one dominated strategy (a choice of integer that would never be a best response to the opponent's choice of integer).
- 5) Mixed strategy Nash equilibrium Consider a mixed strategy Nash equilibrium of the following coordination game: Player 2 Player 1 A B a 5.5 6.-2 b -2,6 1,1 a) In the above game, explain in words what condition player 1's probability p of playing strategy A must satisfy to induce player 2 to mix strategies between a and b in equilibrium. b) Solve for the mixed strategy Nash equilibrium where player 1 chooses A with probability P and player 2 chooses a with probability p, for 0 < p, P < 1.Suppose now we alter the game so that whenever Colin chooses "paper" the loser pays the winner 3 instead of 1: rock paper scissors rock 0. -3 1 1. раper scissors -1 -1 3 (a) Show that xT= (,) and yT= (5) together are not a Nash equilibrium 3'31 for this modified 3'3 game. (b) Formulate a linear program that can be used to calculate a mixed strategy x € A(R) that maximises Rosemary's security level for this modified game. (c) Solve your linear program using the 2-phase simplex algorithm. You should use the format given in lectures. Give a mixed strategy x E A(R) that has an optimal security level for Rosemary and a mixed strategy y E A(C) that has an optimal security level for Colin.7 In bargaining theory, sometimes an individual’s patience level can affect his or her bargaining power. Consider a simple repeated game in which Person 1 makes an offer to purchase a good that Person 2 is selling; Person 2 can either accept this offer or reject it and make a counteroffer. This game continues until one player accepts the other’s offer. Explain how incorporating the rate of time preference (ββ) into such a repeated game might alter the outcome.
- Consider a setting in which player 1 moves first by choosing among threeactions: a, b, and c. After observing the choice of player 1, player 2 choosesamong two actions: x and y. Consider the following three variants as towhat player 3 can do and what she knows when she moves:a. If player 1 chose a, then player 3 selects among two actions: high andlow. Player 3 knows player 2’s choice when she moves. Write down theextensive form of this setting. (You can ignore payoffs.)b. If player 1 chose a, then player 3 selects among two actions: high andlow. Player 3 does not know player 2’s choice when she moves. Writedown the extensive form of this setting. (You can ignore payoffs.)c. If player 1 chose either a or b, then player 3 selects among two actions: high and low. Player 3 observes the choice of player 2, but not that of player 1. Write down the extensive form of this setting.(You can ignore payoffs.)4 In a gambling game, Player A and Player B both have a $5 and a $10 bill. Each player selects one of the bills without the other player knowing the bill selected. Simultaneously they both reveal the bills selected. If the bills do not match, Player A wins Player B's bill. If the bills match, Player B wins Player A's bill. (a) Develop the game theory table for this game. The values should be expressed as the gains (or losses) for Player A. Player B Player A $5 $10 $5 (b) Is there a pure strategy? Why or why not? ---Select--- . Since the maximum of the row minimums is --Select--- (c) Determine the optimal strategies and the value of this game. probability Player A selects $5 probability Player A selects $10 probability Player B selects $5 probability Player B selects $10 = = $10 = = Does the game favor one player over the other? Yes O No and the minimum of the column maximums is (d) Suppose Player B decides to deviate from the optimal strategy and begins playing each bill 50% of the…4. Consider the following variant of the Prisoner's Dilemma game: Player 1 is unsure whether Player 2 is "nice" or "selfish", while Player 2 knows Player 1's preferences. Further suppose that Player 1's preferences depend on whether Player 2 is nice or selfish. Specifically, suppose that there is a probability p that Player 2 is "selfish", in which case the game is given as follows. Game with Selfish Player 2 Player1/Player 2 Cooperate (C) Don't Cooperate (D) Cooperate (C) 4, 4 0, 6 Don't Cooperate (D) 6, 0 2, 2 And Player 2 is "nice" with probability 1-p, in which case the following game results. Game with Nice Player 2 Player1/Player 2 Cooperate (C) Don't Cooperate (D) 2, 4 Cooperate (C) 6, 6 Don't Cooperate (D) 4, 0 0, 2 [Note that C = cooperate (with each other) and D = don't cooperate or defect). a) Write the extensive form of this game. How many strategies does each player have in this game? b) For what values of p (if any) is it a Bayes-Nash equilibrium for Player 1 to play D in…
- 4. Suppose that there is a negotiation between two players over a painting. Person 1, the seller, has no interest in the painting. On the other hand the painting is worth $100 to the buyer. If the painting is sold at a price in between 0 and 100, both are better off. Player 1 proposes a price p to player 2. Then, after observing player 1's offer, player 2 decides whether to accept it or to reject it. If the offer is rejected both get zero and the game ends. Find the unique SPNE of this game.10. Player A and Player B are playing a game . First , Player A chooses to either " Keep " or " Pass " . Second , Player B observes A's choice and Player B then chooses to either Keep or Pass . This process continues which creates the sequential game below . Please mark decisions that rational and selfish players will choose at every decision node ( 3 decisions by player A and 3 decisions by player B ) - mark them on the Figure . What is the equilibrium of this game ?4. Consider the following game, expressed in dollar terms: R $3,$2 $0,$1 D $1,80 $2,$1 (a) Suppose, first, that this game is played by two egoists, for whom u(x,y)=x. Compute all Nash equilibria in pure strategies. (5 points) (b) Is there an equilibrium in mixed strategies? If there is, compute the probability p with which player I plays U and the probability q with which player II plays L. Also, compute the amount of utility each player gets in the equilibrium. (5 points) (c) Are any of these Nash equilibria trembling-hand perfect? (5 points) (d) Suppose, next, that this game is played by two utilitarians, for whom u(x,y)=x+y. Compute all Nash equilibria in pure and mixed strategies. (5 points)