我说个关于“逃税（Tax Evasion）”的例子：研究显示，如果你身边逃税的人多，那么你就更倾向于逃税。

要是有兴趣，可以看看这篇很经典的论文：J.P.F. Gordon (1989), "Individual morality and reputation costs as deterrents to tax evasion," European Economic Review, 33, 797-805.