Bicchieri: preferences for conformity to social norms are conditional on “empirical expectations” (i.e., first-order beliefs that a certain behavior will be followed) as well as “normative expectations” (i.e., second-order beliefs that a certain behavior ought to be followed).
Thus, norm compliance results from the joint presence of a conditional preference for conformity and the belief that other people will conform as well as approve of conformity. https://plato.stanford.edu/entries/social-norms/
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https://plato.stanford.edu/entries/social-norms/