Labor economics is fundamentally about understanding people’s choices and constraints.

The stranger is close to us, insofar as we feel between him and ourselves common features of a national, social, occupational, or generally human, nature. He is far from us, insofar as these common features extend beyond him or us, and connect us only because they connect a great many people.

地主的利益总是与社会中其他阶级的利益相对立。

The quality of your attention determines the quality of your life.

人一生不学习，一天闲过，一事无成，这是人生三件可惜事。