Throughout over 90 percent of our species’ history, we humans lived by hunting and gathering in what anthropologists call gift economies. People had no money, and there was neither barter nor trade among members of any given group. Trade did exist, but it occurred only between members of different communities.
It’s not hard to see why sharing was the norm within each band of hunter-gatherers, and why trade was restricted to relations with strangers. Groups were small, usually comprising between 15 and 50 persons, and everyone knew and depended upon everyone else. Trust was essential to individual survival, and competition would have undermined trust. Trade is an inherently competitive activity: each trader tries to get the best deal possible, even at the expense of other traders. For hunter-gatherers, cooperation—not competition—was the route to success, and so innate competitive drives (especially among males) were moderated through ritual and custom, while a thoroughly entangled condition of mutual indebtedness helped maintain a generally cooperative attitude on everyone’s part.
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