Economics is the study of how societies use scarce resources to produce valuable goods and services and distribute them among different individuals. If we think about the definitions, we find two key ideas that run through all of economics:

技术是存在的一种方式。

当我们既倾听科学家又倾听农民时，真正的进步才会发生。

The mind is a biological adaptation shaped by evolution.

歌唱就是祈祷两次。