On a larger scale, religious denominations affect economics by creating bonds of trust and shared commitment among small groups, both necessary qualities for lending and trade. In the Middle Ages, studies show, monk-run estates outperformed those that used serfs, thanks to religiously inspired cooperation and frugality. The Quakers of 18th-century Britain, renowned for their scrupulous honesty, came to dominate British finance. Ultra-orthodox Jews similarly dominate New York’s diamond trade because of levels of trust based on religion. Modern religious kibbutzim on average outperform their secular rivals, in part because of trust built through engaging in communal religious rituals.Continued...