亚当·斯密《国民财富的性质和原因的研究》：
Every man is rich or poor according to the degree in which he can afford to enjoy the necessaries, conveniencies, and amusements of human life.
一个人是贫是富，就看他能在什么程度上享受人生的必需品、便利品和娱乐品。
原文：
Every man is rich or poor according to the degree in which he can afford to enjoy the necessaries, conveniencies, and amusements of human life. But after the division of labour has once thoroughly taken place, it is but a very small part of these with which a man’s own labour can supply him. The far greater part of them he must derive from the labour of other people, and he must be rich or poor according to the quantity of that labour which he can command, or which he can afford to purchase.
一个人是贫是富，就看他能在什么程度上享受人生的必需品、便利品和娱乐品。但自分工完全确立以来，各人所需要的物品，仅有极小部分仰给于自己劳动，最大部分却须仰给于他人劳动。所以，他是贫是富，要看他能够支配多少劳动，换言之，要看他能够购买多少劳动。
