 Note that universal compliance is not usually needed for a norm to exist. However, how much deviance is socially tolerable will depend on the norm in question. Group norms and well-entrenched social norms will typically be followed by almost all members of a group or population, whereas greater deviance is usually accepted when norms are new or they are not deemed to be socially important. Furthermore, as it is usually unclear how many people follow a norm, different individuals may have different beliefs about the size of the group of followers, and may also have different thresholds for what “sufficiently large” means. What matters to conformity is that an individual believes that her threshold has been reached or surpassed. For a critical assessment of the above definition of norm-driven preferences, see Hausman (2008).