This essay has sought to bring out salient points that can throw light both upon the vexing problems of cultural transformation and on the related phenomena of economic growth. It has employed concepts that are relatively recent in the social sciences and that when synthesized provide the elements of a theory of social change. The five main concepts are: the city as a cross-cultural type; the functional urban hierarchy; the nodular regional structure; effective social, political-administrative and economic space; economic growth as being part of a more comprehensive process leading to successively higher levels of integration of the social system.
From the concept of the city as a cross-cultural type it follows that there are no fundamental distinctions between industrial and preindustrial cities, but both are sharply distinguished from communal village life. All cities have in common a way of life that is characterized by varying degrees of social heterogeneity and cultural vitality, and by inventiveness, creativity, rationality, and civic consciousness. From the fact that cities and the regions related to them may be seen as functionally differentiated and arranged in hieratic fashion it follows that the extent of urban influence will vary with (a) the stage of evolution reached by the hierarchy as a whole, and (b) the relative position of any given city within the hierarchy.
Economic growth has to be seen as part of a comprehensive process of cultural transformation. From the ruthless destruction of old social forms no aspect of society will be spared. It is the influences spreading outward from cities that accomplish both the disruption of the traditional social patterns and the reintegration of society around new fundamental values. The city acts as a coordinating, space-creating force, thus achieving the integration of the social order in its spatial dimensions. Intellectuals, administrators and entrepreneurs are the city's agents in this task. With their success in organizing the life of a society, both as a pattern of activities and as a pattern in space, the traditional notion of a city as a place having definite geographic limits will tend gradually to disappear. Just as Karl Mannheim speaks of fundamental democratization as one of the tendencies of our age, so one may speak of fundamental urbanization as the end-result of modern economic growth. With this, the former distinction between town and country will beblurred and will leave a thoroughly organized, impersonal, and functionally rational society to carry on.