单词：marginal effectiveness
marginal effectiveness的用法和样例：
例句
- People stop at the point where the marginal cost equals the marginal benefit.当边际成本等于边际效益，就是活动停止的时候。
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经济学人财经系列
marginal cost 边际成本 marginal effect 轻微影响 marginal relief 边际宽免；所得税减免 marginal tax band 边际税阶 marginal tax rate 边际税率 marine insurance 海上保险 marin
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