What’s more, the return to bullion was accompanied by the return of a whole host of other conditions that, during the Middle Ages, had been largely suppressed or kept at bay: vast empires and professional armies, massive predatory warfare, untrammeled usury and debt peonage, but also materialist philosophies, a new burst of scientific and philosophical creativity—even the return of chattel slavery. It was in no way a simple repeat performance. All the Axial Age pieces reappeared, but they came together in an entirely different way.
