This Propensity To Truck And Barter Really Is Prehistoric

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We might even define this international trade stuff as being something human beings do as soon as they can. And every example we know of makes the humans who do it richer too:

Trade and growth in the Iron Age

Jan Bakker, Stephan Maurer, Jörn-Steffen Pischke, Ferdinand Rauch 22 August 2018