I went back and took a closer look at Roger Ibbotson's data and there are lots of examples that will illustrate this point, but the most dramatic occurs around the crash in October 1929.

我进一步查看了罗格·伊博森的数据,诸多例子都能说明这一点,但是印象最深刻的,发生于1929年10月的那次股灾

耶鲁公开课 - 金融市场课程节选