there's no scope to provide incentives today for us to cooperate

在今天双方没有继续合作的动机
and we saw things unravel backwards.

而且我们会根据逆向归纳法来行动
So the way in which we ensure that

我们只有通过分析子博弈精炼均衡
we're really focusing on credible promises and credible threats here

才能够分析出我们所认为的前景和恶果
is by focusing on sub-game perfect equilibrium,

其威慑力究竟有多大
the idea that we introduced just before the Thanksgiving break.

这个在感恩节假期前我们就讲过了
We know that sub-game perfect equilibria have the property

我们都知道子博弈精炼均衡满足
that they have Nash behavior in every sub-game,

在任何一个子博弈中都能达成纳什均衡
so in particular in the last period of the game and so on.

这里尤其强调最后一轮也是如此
So what we want to be able to do here,

那么在这里我们就需要学会如何
is try to find scope for cooperation in relationships

在没有签合同和旁支付的情况下
without contracts, without side payments,

利用现有的关系达成合作共识