Using a theory of economic and political gravitation, backed up with both quantitative analysis and qualitative description, Mosk explores trade and migration examining market forces and political resistance to diversity.

Purity condemns filth; piety disparages corruption. Amassing riches offered to a transcendental world, the priests of ancient faiths found themselves trapped in contradiction. By loaning out their resources to merchants, they made themselves pariahs to true prophets. Before Islam squared the circle, bringing capital mobility and credit creation into coexistence with devotion, religion stymied merchant capitalism. Spread through trade, Islam's innovations in commerce soothed the path to coexistence of credit and faith globally. Had a second form of capitalism - technological capitalism - not...