... expected differential cost 预期差别成本 differential cost and revenue 差异成本与收入 differential factor and cost 要素与成本差异 ...
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Differential Cost and Differential Revenue 差异成本与差异收入
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In this paper I get the profit be maximum, as the revenue function, cost function are continuous differential and the margin revenue equals margin cost, that marginal profit equals zero.
当收入函数、成本函数为连续可微函数，边际收入等于边际成本，即边际利润等于零时，利润最大；但在离散情况下，上述结论不一定成立，并给出反例。
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