微观经济,关于纳什均衡的题目,求指教,

微观经济,关于纳什均衡的题目,求指教,
1.单选.
In a Nash Equilibrium of a two player game,both players:




A.Maximise their own payoff given the action of their opponent.

B.Always maximise total surplus.

C.Obtain a Pareto dominated outcome.

D.Would always be better off if they choose to cooperate.

E.None of the above.


2.有如下的payoff matrix:两人只关心自己的收益.





请问这个情况下的纳什均衡是不是(1,1)?


3.同上,两人只关心自己的收益.




请问此时的纳什均衡是什么?




4.情况改变,Column想最大自己受益,但不希望对方无收益.Row不希望对方有任何受益.此时的纳什均衡是哪种组合?









5.囚徒困境的题目,


In an infinitely repeated prisoners’ dilemma game in which players care only about monetary payoffs,can a NE making cooperation the only observed action happen?




Yes,if players observe the lower payoff from defecting.

Yes,if both players have previously shaken hands and agreed to cooperate.

Yes,if both players use punishment strategies.

Yes,only after at least 3 repetitions have elapsed.

No.

麻烦给出简明的解释,快看晕了,好的追分!