Sure enough, all the sciences that study tribes, bands, and villages have approximated ancient groups usually maxed out around 150 people. This is the approximate upper limit to how many people you can trust and count on for favors, whom you can call up and have a conversation with. Once you go over 150 people, Dunbar says about 42 percent of the group's time would have to be spent worrying about one another's relationships.
( David McRaney )
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