 If norms can thrive and spread, they can also die out. A poorly understood phenomenon is the sudden and unexpected change of well-established patterns of behavior. For example, smoking in public without asking for permission has become unacceptable, and only a few years ago nobody would have worried about using gender-laden language. One would expect inefficient norms (such as discriminatory norms against women and minorities) to disappear more rapidly and with greater frequency than more efficient norms. However, Bicchieri (2016) points out that inefficiency is not a sufficient condition for a norm’s demise. This can be seen by the study of crime and corruption: corruption results in huge social costs, but such costs—even when they take a society to the brink of collapse—are not enough to generate an overhaul of the system.