Today it's internet--in the past it was cars, telephones, even railways for a time...
the cities where agriculture was developed probably had populations of just a few thousand
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once in a while you get a groundbreaking development that makes far larger cities possible, which introduces new problems...
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...leading, in turn, to new developments; repeat. Agriculture was one, plumbing another, electricity, medicine, etc
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All such technologies are invented to overcome practical problems associated with large concentrations of people...
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...and once the problems of a certain concentration are solved, the concentration increases.
End of conversation
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