Before revision: Historical effects of increased sedentism 230px|Beja nomads from Northeast Africa Sedentism increased contacts and trade, and the first Middle East cereals and cattle in Europe , could have spread through a stepping stone process, where the productive gift (cereals, cattle, sheep and goats) were exchanged through a network of large pre-agricultural sedentary sites, rather than a wave of advance spread of people with agricultural economy, and where the smaller sites found in between the bigger sedentary ones did not get any of the new products.
After revision: Historical effects of increased sedentism 230px|Beja nomads from Northeast Africa Sedentism increased contacts and trade, and the first Middle East cereals and cattle in Europe , could have spread through a stepping stone process, where the productive gifts (cereals cattle, sheep and goats) were exchanged through a network of large pre-agricultural sedentary sites, rather than a wave of advance spread of people with agricultural economy, and where the smaller sites found in between the bigger sedentary ones did not get any of the new products.