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Graeber shows that 5,000 years ago, during the beginning of the agrarian empires, humans have used elaborate credit systems. It is in this era, Graeber shows, that we also first encounter a society divided into debtors and creditors.

With the passage of time, however, virtual credit money was replaced by gold and silver coins—and the system as a whole began to decline. Interest rates spiked and the indebted became slaves. And the system perpetuated itself with tremendously violent consequences, with only the rare intervention of kings and churches keeping the system from spiraling out of control.