Idea that level of stimulation is very high in urban environments. Therefore certain inputs cannot be processed. In fact, people develop coping strategies to deal with screening out of excessive inputs. The city may be thought of as a collection of different environments. Flight to suburbia, therefore the poorer minorities are increasingly left in the inner cities.
Fear of crime is much lower in suburbia.
Women are very concerned about rape. Some elderly are afraid to leave their homes. In the US family income has not kept pace with housing costs. Many families cannot afford decent housing. Some become homeless.