translation.en: So, in a way, the question is: on what grounds am I upbeat at all about history? And the answer is, first of all, on balance I would say people have played their games to more win-win outcomes than lose-lose outcomes. On balance, I think history is a net positive in the non-zero-sum game department.
translation.zh: 那么，我到底凭什么 对整个历史进程保持乐观的态度呢？答案如下， 第一，总的来说，我认为 人们总是能更多的得到双赢结果。 我认为历史进程，在非零和博弈里，净结果是正的。