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【单选题】
以下关于要素需求和边际收益产品的说法正确的是（）。A.
要素需求不如产品需求那么重要，因而前者又称为派生需求
B.
厂商在决定要素需求时不一定遵守利润最大化的原则
C.
边际收益产品指其他投入不变时，厂商新增一单位某种投入所增加的收益
D.
对垄断厂商来说，边际收益产品等于产品的价格乘以该投入的边际产品
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