在竞争市场上，有许多买者和卖者，每个人对市场价格影响很小，甚至没有影响。
In a competitive market, there are many buyers and sellers, each of whom has little or no influence on the market price.
由史蒂芬·莱维特和斯蒂芬迪布在2005年出版的《魔鬼经济学》(基于经济学教授莱维特的研究)中有许多例证，其中之一是关于面包圈卖者的寓言。
Consider the parable of the bagel seller - one of many examples set out by Steven Levitt and Stephen Dubner in their 2005 book Freakonomics (based on economics professor Levitt's research).
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