Despite social class segregation in housing, people of vastly different economic circumstances are likely to share the same subway car, at least for a few stops.
Ethnic and racial diversity locked up in poor neighborhoods on Chicago's South Side does little good for the regional economy. So why do many blindly associate ethnic diversity with economic development?
Most people don't move to Portland for the usual reason—employment. The City of Roses attracts talent with a focus on urban amenities and regional planning. But that strategy is easy to replicate elsewhere.