wesker1999 发表于 2010-3-30 03:38
三更半夜的人都睡觉去了。
(我不是人)

0jchen321 发表于 2010-3-30 04:33
1# wstcd

请教！！为什么在囚徒困境中，除了((坦白,坦白) 都是pareto-optimum?
这个是怎么看出来的？为什么我觉得只有（不合作，不合作）才是pareto-optimm呢？
谢谢各位了

My understanding of Prisoner's dilemma is the following:

While  (坦白,坦白) is the unique Nash equilibrium, but not Parato efficient.  The key of this example is to show you that equilibrium allocation is not necessary to be Parato efficient. The reason for non Parato efficiency is the effect of externality. In other words,  there is a market failure here.

（不合作，不合作）is not a Nash equilibrium!!

Hopefully, it is helpful.