They have a bias. If you ask them, what's the probability that Yale will win the Yale-Harvard game, don't expect Yale students or Harvard students to give an unbiased probability.

人们有偏向性,如果你问他们,耶鲁与哈佛的比赛中耶鲁胜出的几率有多大,不要指望耶鲁或哈佛的学生会给出,一个公正的答案

耶鲁公开课 - 金融市场课程节选