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。
世界上最伟大的事情就是知道如何属于自己。
A feeling of beauty is a sign that we have come upon a material articulation of certain of our ideas of a good life.
不完全合同是常态，而非例外。
The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.