Who discover encounter hypothesis?

The Encounter Hypothesis is primarily associated with the work of anthropologist Robert L. Carneiro, who proposed it in the context of sociocultural evolution and the development of complex societies. This hypothesis suggests that social complexity arises from interactions between different groups, particularly through warfare, trade, and other forms of exchange. Carneiro's ideas have significantly influenced the fields of anthropology and Archaeology in understanding the emergence of social hierarchies and state formation.