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:

解决问题是智能系统的核心活动。

艺术越个人化，就越普遍。

【解释】不是自己分内应享受的幸福，无缘无故得到意外之财，即便不是上天的诱饵，也是诈骗的陷阱，不睁大眼睛，就会落入圈套中。