In case of changing the single factor, the cost of marginal value should equal to its marginal profit.

在单一要素变动的情况下，边际价值成本应当等于边际价值收益。

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Firstly this paper tells research category and meanings of cost control and analyses how to control costs by value chain and cost drive factor.

文中讲述了成本控制的研究范畴及其含义，通过价值链和成本驱动因素分析研究成本控制的方法和途径。

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In the course of creating and realizing value in business, cost is a decisive factor in influencing the economic benefit, which can only be increased when the cost is under strict control.

在企业创造价值和实现价值的过程中，成本是影响企业经济效益的决定性因素，企业要提高经济效益，必须加强成本控制。

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