问题描述：
求英语达人长难句分析
An important factor in a market-oriented economy is the mechanism by which consumer demands can be expressed and responded to by producers.这个句子里最后的to by如何理解.
An important factor in a market-oriented economy is the mechanism by which consumer demands can be expressed and responded to by producers.这个句子里最后的to by如何理解.
问题解答：
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