政策规则优于自由裁量，因为它们避免了时间不一致性问题。

True happiness arises, in the first place, from the enjoyment of one's self, and in the next, from the friendship and conversation of a few select companions.

It took untold generations to get you where you are. A little gratitude might be in order. If you're going to insist on bending the world to your way, you better have your reasons.

以耗尽地球为代价的利润根本不是利润。