"No economic activity was more irrepressible [in the 14th century] than the investment and lending at interest of money; it was the basis for the rise of the Western capitalist economy and the building of private fortunes-and it was based on the sin of usury."

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As a matter of fact, capitalist economy is not and cannot be stationary. Nor is it merely expanding in a steady manner. It is incessantly being revolutionized from within by new enterprise, i.e., by the intrusion of new commodities or new methods of production or new commercial opportunities into the industrial structure as it exists at any moment.

— Joseph A. Schumpeter