I think the best answer to that is a quote from one of my contemporaries, who I think is one of the best investment managers out there.

我可以用我同行的一句话,来回答这个问题,他在我眼中是最优秀的投资经理

耶鲁公开课 - 金融市场课程节选

I got a note from him and I'm still trying to figure it all out That's what happens; the system performs very well and then it becomes vulnerable.

我对他的回答做了笔记,我还在尝试把这个问题搞清楚,事情就这样发生了,一个系统本来运行良好，然后就变得很脆弱。

耶鲁公开课 - 金融市场课程节选