It seems clear that the concept of ownership of land came with farming. Farming could be a cooperative enterprise, but it could also be a 'one person, one field' deal. More broadly, it gave rise to the possibility of 'individualism': all that follows from the idea of people existing in some cultural context other than the group-oriented ethos of foragers (and pastoralists), which was basically 'one for all and all for one'. With 'surplus' and 'reinvestment', farming led to significant disparities in wealth and also to some working for other individuals. Add in slavery, cities, and conquest, and the rest is the sad history of humanity since that time.