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The Inca Civilization had no money was was pretty darn successful

Tiny fiefdom. Think of the insane size of what we call society even 100 years ago, money is what makes us cooperate.

I wouldn't call the Inca Empire a "tiny fiefdom", at its height they had 10 million citizens and covered 2 million km2

doubt they had the absolute control on law that a modern state has, empire in the loosest/historical sense