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William M. Landes , Richard A. Ponser , Trademark Law : An Economic Perspective , 30 Journal of Law and Economics 265 （1987） . 邊際成本是中經(jīng)常提到的概唸;它是指每一個(gè)單元成本;該成本代表了每生産一個(gè)額外單元的産品所增加的必要成本.