经济学中 opportunity cost = explicit cost + implicit cost 我想请问一下 教科书V2 P94中有提及 economic depreciation 是包含在 implicit cost 里面 但我做到一个例题如下： Total revenue $300,000 Value of buildings and machinery At the beginning of the year $300,000 At the end of the year $280,000 Cost of raw materials $100,000 Wages paid during the year $50,000 Normal profit for the year $40,000 然它给的解答是 opportunity cost = 100,000+50,000+40,000=190,000 economic depreciation = 300,000-280,000=20,000 economic profit=Total revenue-opportunity cost-economic depreciation =300,000-190,000-20,000=90,000 为什麽当中的economic depreciation:$20,000要再多减一次？ 不知道是不是我哪里解读错误？ 以上是我的问题，先谢谢大家帮忙。 --

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