Psychology

Your brain caps your social circle at roughly 150 people

Comparing primate brain sizes with their group sizes, Robin Dunbar predicted humans can maintain about 150 stable relationships. The number keeps turning up: Neolithic villages, Roman army units, Hutterite communities, and the point where companies start needing org charts.

— Robin Dunbar, Neocortex size as a constraint on group size in primates — Journal of Human Evolution, 1992

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