Process related to (a) the displacement of the population from rural to urban areas, resulting in greater populations of cities and declining rural populations and (b) a process associated with increasing the role of cities, including certain aspects of culture, characteristic for cities, resulting in a decline of the culture of the village. In the world's cities with a population of more than 100 OOO people live more than 20% of the population. It is expected that by the year 2000, the urban population will account for 40% of the population.