理性的消费者开始关注产品的质量问题，价格竞争开始向质量竞争转化。

Rational consumers begin and pay close attention to quality problems of products, price competition begin transform to the quality competition.

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但是，为什么这些销售人员还是希望以低价出售呢？任何理性的消费者都会认为他们的质量是没有保证的。

But why would those salespeople like to sell their products at such a low price? Any rational customers can hence conclude that their quality is not guaranteed.

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但作为一名理性的消费者，人们应该进行收益成本分析，同时应该确定他们想做的事也是他们实际能做的事。

But, as a rational consumer, they need to compare and calculate all the benefits and costs associate with what they want to do, and also make sure what they want to do is what they actually can do.

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