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The following three problems are about the mini-ultimatum game in which the proposer receives 1000 yen as endowment and Y yen as a possible offer
The following three problems are about the mini-ultimatum game in which the proposer receives 1000 yen as endowment and Y yen as a possible offer amount. Here, let XXX be the last three digits of your student ID, and Y=XXX yen. However, in case your XXX is 000 or 001, then let Y=521. Answer the problems, assuming that each player is a selfish economic man for the analysis based on game theory (Do not consider mixed strategies as this course only treats pure strategies).
A) Consider a mini-ultimatum game in which the proposer can offer either 1 yen or Y yen to the responder. Assume that each player shows his own strategy at the beginning of the game, and the responder makes a commitment to his own strategy even if the mood changes. Write a payoff table for this game and find all the Nash equilibria. Explain why each of these strategy pairs is a Nash equilibrium, while the others are not.
B) Suppose that the mini-ultimatum game in the previous problem is played as a sequential game. Draw a game tree, illustrating that offering 1 cent is a subgame perfect equilibrium and that offering Y yen is not subgame perfect equilibrium. Write the payoffs of the proposer and the responder as two numbers in parentheses in the game tree diagram.
C) Consider another mini-ultimatum game in which the proposer can offer can either 0 yen , 1 yen, or Y yen to the responder. Draw two game trees, illustrating that there are two subgame perfect equilibria, and that there is no other subgame perfect equilibrium. Draw one tree for a subgame perfect equilibrium and show the best response in each node by making the appropriate branch a bold line. Write the payoffs of the proposer and the responder as two numbers in parentheses in each of the game tree diagrams.
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