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:

研究的坚持是关键；自然只向有耐心的人揭示它的秘密。

可持续性不仅仅是一个选择；这是我们对后代的责任。