If you have profit sharing in a firm or profit sharing in homework assignment, or any joint projects, you have to worry about too little effort being contributed because there's an externality.

如果你是一个公司的股东,或者和别人一起做作业及其他合作项目,你们需要注意到因为外部性,实际上每个人都付出了较少的努力

耶鲁公开课 - 博弈论课程节选

But at the last moment, His brother Judah convinces the brothers that, if instead of killing him, they sell him, they can profit a little for their troubles. So Joseph is sold ultimately ends up in the household of Pharaoh in Egypt, and his adventures there prove his meritorious character.

但是在最后一刻，他的哥哥犹太说服了其余的兄弟们，不要杀他，如果卖了他，他们还能从中获利，于是约瑟夫就被卖了,他最后生活在埃及一个法老的家里，他在那儿的冒险也证明了他值得称道的品格。

耶鲁公开课 - 旧约导论课程节选