Along with the development of these theories, urban sociologists have increasingly begun to study the differences between the urban, rural and suburban environment within the last half-century. Consistent with the community liberated argument, researchers have in large part found that urban residents tend to maintain more spatially-dispersed networks of ties than rural or suburban residents. Among lower-income urban residents, the lack of mobility and communal space within the city often disrupts the formation of social ties and lends itself to creating an unintegrated and distant community space. While the high density of networks within the city weakens relations between individuals, it increases the likelihood that at least one individual within a network can provide the primary support found among smaller and more tightly knit networks.