大萧条是20世纪历史上的一个决定性时刻，理解其原因和后果仍然是经济学家的一项重要任务。

The destiny of world civilization depends upon providing a decent standard of living for all mankind.

I ask senior leaders to not do anything unless they're willing to do it for 10 years.

The only thing I can say is that I try to be humble all the time.

材料不仅仅是表皮，它是建筑的灵魂。