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.
应用灰色系统理论和宏观、微观经济学原理，以及系统工程的理论和方法，进行了城际交通运输需求分析。
The transport demand among the cities have been analysed by using the gray system theory, macroscopic and microcosmic economics principles and system engineering theory.
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