To read the narrative and see further sections under each listed heading, please see "More" below.

Changing Employment Mix
Cities have an economic base, which is comprised of two sectors: the basic sector and the nonbasic sector.

Changing Demographic and Social Structures
Cities have always attracted migrants. Because cities in the industrial world normally need workers, and the source of workers shifts from time to time, there is a constant change in the origin of migrants to a city, which makes cities diverse. This process of migration is discussed in more depth in the Population section of the course.