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:
经济学特别是宏观经济学中说的投资是耐用资本品如厂房设备的生产，而平常说的“投资”是指购买资产如股票，这和经济学中的投资不同，为了区分，这种投资被称为金融投资。
当爱成为命令时，恨就能成为快乐。
You can't please everyone, so don't try.
The measurement problem in quantum mechanics is not a flaw in the theory, but a profound insight into the nature of reality.
Diversity in forest species mirrors the diversity needed in business thinking.
最深刻的真理往往存在于最简单的时刻。
逝者从未真正离去，他们活在我们讲述的故事中。
解释：对社会有用的，创作百篇也没有害处；对社会无用的，写一章也没有好处。