不要把名字写在沙滩上，海浪会冲走它。不要把名字写在天空中，风可能会吹走它。把你的名字写在人们心里，那里才是它永存的地方。

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:

The best technology is invisible—it just works.

一项发明可能价值连城，但对发明者却毫无价值。

无力感会腐化。绝对的无力感会绝对地腐化。