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【单选题】
A production possibilities frontier is bowed outward whenA.
the more resources the economy uses to produce one good, the fewer resources it has available to produce the other good.
B.
an economy is self-sufficient instead of interdependent and engaged in trade.
C.
the rate of tradeoff between the two goods being produced is constant.
D.
the rate of tradeoff between the two goods being produced depends on how much of each good is being produced.
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