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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.

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。

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Network calculus is primarily used to dispose the flow problem in networks, and it can be used for flow problem modeling and quantitative analysis of flow problem.

网络微积分主要用于对网络中流问题的考察，它所形成的体系可以用于对网络中的流问题进行建模和定量分析。

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And the economic calculus which we have developed to solve this logical problem, though an important step toward the solution of the economic problem of society, does not yet provide an answer to it.

FORBES: The Use of Knowledge on the Internet