作者论述了微观经济学中边际概念与弹性概念的数学背景，并指出它们在经营管理中的一些应用。
This paper discusses the mathematical backgrounds of the margin concept and elasticity notion in microeconomics and points out some applications in business management.
在1738年，丹尼尔试图用微积分来解决一个概率论和赌博理论里的问题，无意间却发现了货币的边际效用递减法则的概念。
In 1738, Daniel, trying to solve a problem in probability theory and the theory of gambling by use of the calculus, stumbled on the concept of the law of diminishing marginal utility of money.
如果效率的概念甚至对个人都一钱不值，当经济学家用加总全社会的方法来使用这个概念时，就太不着边际了。
If the concept of efficiency is worthless even for each individual, it is a fortiori in far worse straits when the economist employs it in an additive way for all of society.
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