Propylaeum

In 1981 Sherrat presented his model of a „Secondary Products Revolution“. He tried to that social and societal changes emerged in the Neolithic Period of the Old World when the usage of animal “secondary” products was introduced in the 4^th millennium BC. Sherratt considers the usage of animal force (pulling of carts/ploughing and riding) as well as the production of cheese and wool as forms of these “secondary” products. As a result of his revolution he argues that two societal forms arose: on the one hand settled crop farmers and on the other hand nomadic cattle breeders who lived in conflict and symbiosis with the farmers.