I forgot which of the founding fathers said something to the likes to: I’ll study military tactics so my children can study law and engineering, and their kids art and music (very very rough paraphrase).
So society has advanced enough to outsource “Maslow’s Hierarchy of Needs” to intuitions and away from individuals. They somewhat automated processes like shelter and safety so that the individual doesn’t have allocate processing power for those tasks. They are free to study other things outside of capturing food, defending their territory, etc.
As populations increased the more people can fill those institutions and thus the more people are freed from those tasks and can ponder about innovations and such.
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