It is the retention by twentieth-century, Atom-Age men of the Neolithic point of view that says: You stay in your village and I will stay in mine. If your sheep eat our grass we will kill you, or we may kill you anyhow to get all the grass for our own sheep. Anyone who tries to make us change our ways is a witch and we will kill him. Keep out of our village.
The end of the Neolithic age betokens almost as universal a re-orientation of life, almost as profound a revolution of economy and society, as its beginning. Then the break was marked by the transition from mere consumption to production, from primitive individualism to co-operation, now it is marked by the beginning of independent trade and handicrafts, the rise of cities and markets, and the agglomeration and differentiation of the population.