Nothing lasts forever, as any student of the business cycle knows. But recognizing that the economy is dynamic, and constantly shape shifting, doesn’t make it any easier to spot trend changes in real time.
正如任何研究商业周期的人都知道的那样,没有什么是永恒的。但认识到经济是动态的、不断变化的,并不能让实时发现趋势变化变得更容易。