Peter Richerson & Robert Boyd

Some scholars, including most economists, many psychologists, and many social scientists influenced by evolutionary biology, place little emphasis on culture as a cause of human behavior. Others, especially anthropologists, sociologists, and historians, stress the importance of culture and institutions in shaping human affairs, but usually fail to consider their connection to biology. The success of all these disciplines suggests that many questions can be answered by ignoring culture or its connection to biology. However, the most fundamental questions of how human came to be the kind of animal we are can only be answered by a theory in which culture has its proper role and in which it is intimately intertwined with other aspects of human biology.

Peter Richerson & Robert Boyd, Not by Genes Alone: How Culture Transformed Human Evolution, Chicago, 2005, p. 4