They say when people learn that the prostitute in a brothel may be an unwilling victim of sexual exploitation or the cheap jeans they buy in a store are produced by people working some of these forms of contemporary slavery may dry up.

VOA: standard.2009.08.21

On my day off, I'll go down, buy cheap outfit,

休息的时候，我就出去，买套便宜的套装，

我就是超人 - SpeakingMax英语口语达人

You buy what's cheap and sell what's expensive.

你肯定买贱卖贵嘛

耶鲁公开课 - 金融市场课程节选