根据新古典主义经济学（目前比较流行的Hi there Makoo,
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This confirmation code will expire at 10:11, 17 February 2014.一种经济学理论），物体的价值就是该物体在一个开放和竞争的交易市场中的价格，因此价值主要决定于对于该物体的需求，而不是供给。有些经济学者经常把价值等同于价格，不论该交易市场竞争与否。