问题描述：
Thus,in the American economic system it is the demand of individual consumers,coupled with the desire of businessmen to maximize profits and the desire of individuals to maximize their incomes,that together determine what shall be produced and how resources are used to produce it.
第一个it是个什么结构.干什么用的?
第一个it是个什么结构.干什么用的?
问题解答：
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