How social norms evolve over time and what affects their evolution are central questions in the literature about norms. A study suggests that over time, hygiene and violence norms have become stricter, because those who prefer strict norms sanction those who prefer loose norms more than sanctioning in the other direction.
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The author declares no competing interests.
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Azar, O.H. Social norms evolve with asymmetric sanctions. Nat Hum Behav 2, 113–114 (2018). https://doi.org/10.1038/s41562-017-0288-x