Seventhly, Wirth argued that while traditional ties have decreased, interdependence between people has increased. In cities it becomes important to communicate through indirect media and to articulate individual interests by a process of delegation. Typically in the city, interests are made effective through representation.

Finally, social control in the cities proceeds through formally organized groups. It follows too that the masses of men in the city are subject to manipulation by symbols and stereotypes managed by individuals working from afar. In other words, they are operating invisibly behind the scenes through their control of the instruments of communication.