Hereditary economic inequality is unknown among mobile foragers, but hereditary class distinctions between elites and commoners exist in some sedentary foraging societies. With agriculture, such stratification tends to become more pronounced. We develop a model to explain the associations among...

The duel of honor was a highly ritualized violent activity practiced (mostly) by aristocrats from about 1500 to 1900. The duel of honor was held in private, was attended by seconds and other members of society, was illegal, and often resulted from trivial incidents. Duels were fought according...

During the roughly 190,000 years between the emergence of anatomically modern humans and the transition to agriculture, sustained economic progress was rare. Although there were important innovations in the Upper Paleolithic, evidence from paleodemography indicates that population densities were...