My guess is that much of this is the result of traditional American ebullience: the view that what goes down will sooner or later bounce back up. This is one of the reasons why America has represented a quarter or more of the world’s output for the best part of 150 years.
我猜这在很大程度上是受到传统美式精神的影响：人们会相信所有跌落低谷的东西都有卷土重来的一天。而这也是过去150年的绝大部分时间内美国经济一直能占据世界总产值四分一强的原因之一