- Consider the following two-player game: H L T D 2,3 0,2 4,0 1,1 (a) What are (pure- and mixed-strategy) Nash equilibria of this game? (b) Suppose the game is repeated twice, and each player's payoff is the sum of the payoffs they obtain in the two periods. What are the subgame perfect equilibria of the game?
- Consider the following two-player game: H L T D 2,3 0,2 4,0 1,1 (a) What are (pure- and mixed-strategy) Nash equilibria of this game? (b) Suppose the game is repeated twice, and each player's payoff is the sum of the payoffs they obtain in the two periods. What are the subgame perfect equilibria of the game?
Chapter1: Making Economics Decisions
Section: Chapter Questions
Problem 1QTC
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![3. Consider the following two-player game:
H
L
D
T
2,3 0,2
4,0 1,1
(a) What are (pure- and mixed-strategy) Nash equilibria of this game?
(b) Suppose the game is repeated twice, and each player's payoff is the sum of the
payoffs they obtain in the two periods. What are the subgame perfect equilibria
of the game?
(c) Suppose the game is repeated indefinitely, and each player discounts his/her payoff
with a discount factor 8 € (0, 1). Find a subgame perfect equilibrium in which
(H, T) is played in every period on the equilibrium path. Compute the discount
factor & needed for this equilibrium.
(d) Suppose the game is repeated indefinitely, and each player discounts his/her payoff
with a discount factor & € (0, 1). Find a subgame perfect equilibrium in which
(H,T) and (L,T) are played alternately on the equilibrium path. Compute the
discount factor & needed for this equilibrium.
(e) Suppose the game is repeated indefinitely. Player 1 (the row player) discounts
her payoff with a discount factor 8₁ € (0,1). Player 2 discounts his payoff with
a discount factor d₂ = 0. That is, in any given period, player 2 only cares about
his payoff in that period. Can you find a subgame perfect equilibrium in which
(H,T) is played in every period on the equilibrium path. If no, explain. If yes,
compute the discount factor 8₁ needed for this equilibrium.
(f) Suppose the game is repeated indefinitely. Player 1 (the row player) discounts
her payoff with a discount factor 8₁ € (0,1). Player 2 discounts his payoff with
a discount factor d2 0. Can you find a subgame perfect equilibrium in which
(H,T) and (L,T) are played alternately on the equilibrium path? If no, explain.
If yes, compute the discount factor 81 needed for this equilibrium.
(g) Suppose the game is repeated indefinitely. Player 1 (the row player) discounts
her payoff with a discount factor d₁ € (0,1). Player 2 discounts his payoff with
a discount factor 82 = 0. Can you find a subgame perfect equilibrium in which
(H,T) and (L, D) are played alternately on the equilibrium path? If no, explain.
If yes, compute the discount factor 8₁ needed for this equilibrium.
2
(h) Bonus problem: Suppose the game is repeated indefinitely. Player 1 (the row
player) discounts her payoff with a discount factor d₁ € (0, 1). Player 2 discounts
his payoff with a discount factor d₂ = 0. In addition, player 2 is forgetful: in any
given period, he can only remember player 1's action in the previous period (he
forgets everything else, including his own actions in the past). Player 2's forget-
fulness is commonly known. Player 1 never forgets. Can you find an equilibrium
in which (L, D) is not played every period on the equilibrium path? Explain.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F717b34e4-444f-4d3b-8a05-2c02201f8916%2F790d9b65-f470-438a-a5b0-636694684cf6%2Ft3fxlxn_processed.png&w=3840&q=75)
Transcribed Image Text:3. Consider the following two-player game:
H
L
D
T
2,3 0,2
4,0 1,1
(a) What are (pure- and mixed-strategy) Nash equilibria of this game?
(b) Suppose the game is repeated twice, and each player's payoff is the sum of the
payoffs they obtain in the two periods. What are the subgame perfect equilibria
of the game?
(c) Suppose the game is repeated indefinitely, and each player discounts his/her payoff
with a discount factor 8 € (0, 1). Find a subgame perfect equilibrium in which
(H, T) is played in every period on the equilibrium path. Compute the discount
factor & needed for this equilibrium.
(d) Suppose the game is repeated indefinitely, and each player discounts his/her payoff
with a discount factor & € (0, 1). Find a subgame perfect equilibrium in which
(H,T) and (L,T) are played alternately on the equilibrium path. Compute the
discount factor & needed for this equilibrium.
(e) Suppose the game is repeated indefinitely. Player 1 (the row player) discounts
her payoff with a discount factor 8₁ € (0,1). Player 2 discounts his payoff with
a discount factor d₂ = 0. That is, in any given period, player 2 only cares about
his payoff in that period. Can you find a subgame perfect equilibrium in which
(H,T) is played in every period on the equilibrium path. If no, explain. If yes,
compute the discount factor 8₁ needed for this equilibrium.
(f) Suppose the game is repeated indefinitely. Player 1 (the row player) discounts
her payoff with a discount factor 8₁ € (0,1). Player 2 discounts his payoff with
a discount factor d2 0. Can you find a subgame perfect equilibrium in which
(H,T) and (L,T) are played alternately on the equilibrium path? If no, explain.
If yes, compute the discount factor 81 needed for this equilibrium.
(g) Suppose the game is repeated indefinitely. Player 1 (the row player) discounts
her payoff with a discount factor d₁ € (0,1). Player 2 discounts his payoff with
a discount factor 82 = 0. Can you find a subgame perfect equilibrium in which
(H,T) and (L, D) are played alternately on the equilibrium path? If no, explain.
If yes, compute the discount factor 8₁ needed for this equilibrium.
2
(h) Bonus problem: Suppose the game is repeated indefinitely. Player 1 (the row
player) discounts her payoff with a discount factor d₁ € (0, 1). Player 2 discounts
his payoff with a discount factor d₂ = 0. In addition, player 2 is forgetful: in any
given period, he can only remember player 1's action in the previous period (he
forgets everything else, including his own actions in the past). Player 2's forget-
fulness is commonly known. Player 1 never forgets. Can you find an equilibrium
in which (L, D) is not played every period on the equilibrium path? Explain.
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