The chapter sets out the material conditions and social structure of the hunter-gatherer era, emphasising the role of kinship, mobility, egalitarianism and trade. It sees the material and social structures as relatively stable then looks at the long transition between the hunter-gatherer era and the era of congolmerate, agrarian/pastoralist empires, emphasising climate change as the key to population growth, settlement, technological change, and the shift to agriculture. It notes the shift from biological to social evolution, and the link between settlement and a move away from egalitarian relations. Agriculture reinforces settlement rather than causing it.