Template-type: ReDif-Paper 1.0 Author-Name: Rusch, Hannes Author-workplace-name: RS: GSBE UM-BIC, Microeconomics & Public Economics, RS: GSBE other - not theme-related research Author-Name: Vostroknutov, Alexander Author-workplace-name: RS: GSBE UM-BIC, RS: GSBE other - not theme-related research, Microeconomics & Public Economics Title: The evolution of personal standards into social norms Abstract: Social norms have become a conceptual cornerstone in the study of human decision making across the social sciences. The functions of social norms in guiding individual and collective decision-making have been extensively scrutinized empirically, too. However, possible evolutionary origins of the psychological mechanisms required to carry out these functions are less well understood. In particular, trajectories from individually adaptive to socially functional heuristics for norm formation have rarely been studied. Here, we trace such a trajectory. We present a model that allows for the comparison of two heuristics broadly applicable across individual and social decision contexts: ‘rejoicing’ own achievements vs. ‘regretting’ missed opportunities. We find that (i) both perform better than the homo oeconomicus benchmark in individual decision problems under plausible ecological assumptions and (ii) each is adaptive in different environments. We argue that observation (i) provides a potent microfoundation for social norms as a product of co-optation of individually evolved heuristics, i.e., a reduction of social norm formation to the evolution of individual traits. Moreover, observation (ii) lends itself to empirical testing, thus laying the ground for a new wave of studies in the literature fascinated with human norm psychology. Series: GSBE Research Memoranda Creation-Date: 20240909 Number: 011 File-URL: https://cris.maastrichtuniversity.nl/ws/files/215118257/RM24011.pdf File-Format: application/pdf File-Size: 605564 Handle: Repec:unm:umagsb:2024011 DOI: 10.26481/umagsb.2024011