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An externality is a cost or a benefit imposed upon someone by actions taken by others.。
An externality is a cost or a benefit imposed upon someone by actions taken by others.。
A.正确
B.错误
正确答案：正确
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中级微观经济学
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In a Edgeworth box there are lot of ；allocations that are Pareto-optimal.。
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An economic situation involves a production externality if one firm’s production possibility is affected by the choices of the other firms not the consumers’.。