Once upon a time we nomads settled down and created agriculture. The efficiencies of that agriculture released labour for both trade and the trades which in turn evolved centres of production and consumption which we know as rural villages, harbour towns and market towns. I’ll leave aside the influences (usually malign) of power in the simultaneous creation of walled cities, fortresses, trade blocs, dukedoms, ring roads, cloned towns, retail parks, gated communities and distorted and perverse social systems.