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:

导演就是要创造一个让演员感到安全去冒险的环境。

You have to be willing to fail in order to succeed.

真正的工艺会让产品和地球都比发现时更好。

量化宽松的问题在于它在实践中有效，但在理论上却行不通。