translation.en: Now let's imagine that you were an economist in 1929, trying to forecast future growth for the United States, not knowing that the economy was about to go off a cliff, not knowing that we were about to enter the greatest economic disaster certainly in the 20th century.
translation.zh: 让我们想象一下, 在1929年,如果你是一位经济学家 试图预测美国的未来经济增长率, 你还不知道美国经济即将猛降. 不知道我们即将进入 20世纪最重大的经济灾难期.