That seems to be the core of the meaning of the word as it is most consistently used. Implicit in this definition is a suggestion about why it is so difficult for “smart money” to profit by betting against bubbles: the psychological contagion promotes a mindset that justifies the price increases, so that participation in the bubble might be called almost rational.
这似乎是泡沫这个词最核心的意思，也是最常用的用法。这个定义隐含的含义是“聪明钱”为何极难通过赌反向下注从泡沫中赚钱：心理传染催生了论证价格上涨合理性的观念，因此参与泡沫可谓“几乎”（almost）理性。但其实是不理性的。