Suppose that the stage game below is infinitely repeated and the players have a common discount factor 8. Using grim trigger/Nash reversion strategies, for what values of 8 can (C, C) each period be implemented as a subgame perfect equilibrium? 2 C D C 3,3 -2,9 D 9,-2 1, 1 1
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- rock paper scissors rock 0. -3 0. раper scissors -1 -1 3. 0. (a) Show that xT= (,) and yT= (,) together are not a Nash equilibrium 3' 3 3131 for this modified game.For the friend-foe game, recall that there were 3 Nash equilibria possible, but the equilibria set didn't include the cooperative outcome, for which both players would win. Friend Foe Friend 500,500 0,1000 Foe 1000,0 0.0 a) If the game is played répeatedly. propose a play strategy that will enforce cooperation. For what valucs of o (discount factor) the equilibrium will be (Friend. Friend)?Analyze payoff matrix below. a-) Consider the grim trigger strategy for the game? Analyze the conditions for which this strategy constitutes an subgame perfect equiillbria. b-) Analyze the conditions for the tit for tat strategy to be equilibrium for the following histories: Histories that ends with (C,C) and (C,D) p1/p2 D 3.3 0.5 D 5,0 1,1
- on Mary, UE, BD UF, AC DF, BC UF, BD DE, AC DE, BC Nancy U D Nancy -5,4 Mary -0,2 -6,2 -2.6 Which of the following answers is a subgame perfect Nash equilibrium in this game? Check all that apply. (Answers below are formatted as Mary's strategy, Nancy's strategy.)し(5,3) b I(2,2) も(0,0) (4,12) a (12.4) (0,0) i). List all subgame pertect Nash equilibria and name one Nash eqvilibrivm that is not subgame pertect i). How many strategies does playot and player 2 have?(a) Design a two-player game with the property that "the payoff for Player1 is Playerl plays a strategy Sl and Player2 plays a strategy S2 is the same as the payoff for Player2 if Player2 plays Sl and Playerl plays S2". Express your game in terms of payoff matrices. Show the above property holds in your given payoff matrices. Give a case to show that there is one Nash equilibrium and such an equilibrium is also a Pareto efficient (justify your answers) in your given payoff matrices. Prove or disprove the above case that is unique. Give another example to show that there are two Nash equilibria in your given payoff matrices.
- parameter z= 1 In the unique subgame perfect Nash equilibrium, what is the sum of the payoffs tothe two players?Two farmers have unlimited access to a common plot of land and can let their cows graze on it. The matrix below shows the benefits they get from grazing either 1 or 2+ cows on the land. Farmer 2 Farmer1 1 cow 2+ cows 1 cow 8,8 2,10 2+cows 10,2 4,4 What kind of game is this? What is/are the Nash equilibrium/equilibria? What is/are the Pareto efficient outcome(s) in this game? (Hint: Remember that Pareto efficiency occurs when no one person can be made better off without someone else being made worse off) The government offers a reward or subsidy for communities where farmers only allow 1 cow to graze on the common field, resulting in a new payoff matrix:…Consider the following two-player game with three options for each player. (Payouts are listed for the row player first, then the column player.) player Y layery 3,3 A 1,5 4,4 6,2 K 8,1 3,7 5,2 0,6 1,1 Find a mixed Nash equilibrium for this game. Solution suggestion: Use two variables per player. If p and are the probabilities of selecting the first two strategies, then 1-p-q is the probability of selecting the third strategy. You will need to solve a system of equations.
- Suppose that the stage game below is infinitely repeated and the players have a common discount factor 8. Using grim trigger/Nash reversion strategies, for what values of 8 can'(C, C) each period be implemented as a subgame perfect equilibrium? 2 C D C 3,3 -2,9 D 9,-2 1, 1 1a) Draw an extensive form game with 4 outcomes (2 moves for player 1 followed by 2 moves for 2 after each of 1's moves) and no pure strategy Nash equilibrium. b) Write the strategic form to verify your answer to (a) c) Draw an extensive form 2-player game, in which both players always move, that has exactly 4 outcomes, 1 subgame perfect Nash equilibrium and no non-subgame perfect Nash equilibrium and no dominant strategies. d) Write the strategic form and use it to verify your answer to (b)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.