Happiness is like a butterfly; the more you chase it, the more it will elude you. But if you turn your attention to other things, it will come and sit softly on your shoulder.

The historian’s first duty is to the truth.

货币政策中的时间不一致性问题出现在政策制定者一旦经济主体根据宣布的政策采取行动后，就有动机偏离该政策。

"The number one benefit of information technology is that it empowers people to do what they want to do. It lets people be creative. It lets people be productive. It lets people learn things they didn't think they could learn before, and so in a sense it is all about potential."