How many of you have a written contract, stuck with a magnet on the fridge, telling you when you're supposed to tidy up.

有人写过协议吗,在冰箱上贴个磁力贴,规定好什么时候该谁打扫房间

耶鲁公开课 - 博弈论课程节选

And if the other guy does tidy up, hey the room's clean, Who cares? So either way, you're not going to tidy up and you end up with a typical Yale dorm room.

要是别人打扫完了,屋子干净了,我赚了,最后谁都不去打扫寝室,寝室当然就脏了

耶鲁公开课 - 博弈论课程节选