Because if they work any harder than that, then the other person is just going to slack off instead.

因为我们知道如果自己超额完成工作,其他人就可以少做点工作了

耶鲁公开课 - 博弈论课程节选

You pretest to make sure that the person doesn't like any M&M more than the other.

你预先测试过,这个人对所有M&M巧克力豆都一样喜欢。

耶鲁公开课 - 心理学导论课程节选