求助一道与宏观经济学有关的选择题When a production possibilities frontier is bowed out, away from the origin, the opportunity cost of a good: A. Falls as the quantity of this good increases B. Increases as the

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求助一道与宏观经济学有关的选择题
When a production possibilities frontier is bowed out, away from the origin, the opportunity cost of a good:




A. Falls as the quantity of this good increases

B. Increases as the quantity of this good increases

C. Stays the same at all quantities of the good

俺选A,关税降低,货物量的增减对货物花费影响,嘿嘿

A