囚犯困境（Prisoner`s dilemma）

徒困境来表示？如果政府以这种方式来制定政策，那么什么是囚徒困境的均衡解？如果政府需要选择贸易保护策略呢？

If governments make trade policies based on national economic welfare， is the problem of trade warfare still represented by a “Prisoner's dilemma” game as in Figure 9-3？ What is the equilibrium solution to the game if governments formulate policy in this way？ Would they ever choose the strategy of protectionism？

在囚犯困境的博弈中，如果是重复博弈的话，囚犯们就有可能选择都抗拒的结果。()

在囚犯困境的博弈中，事先订立攻守同盟一定是有用的。()

A.自信

B.信任

C.责任

D.竞争