But perhaps he underestimated the role played by noneconomic incentives in the behavior of masses: by religious fervor, as in Moslem or Spanish armies; by nationalistic ardor, as in Hitler’s troops or Japan’s kamikazes; by the self-fertilizing fury of mobs, as in the Gordon riots of June 2–8, 1780, in London, or the massacres of September 2–7, 1792, in Paris.