This segregation of people based on social class (as well as ethnicity and/or native/immigrant divide) is a big social problem that was unfortunately exacerbate

This segregation of people based on social class (as well as ethnicity and/or native/immigrant divide) is a big social problem that was unfortunately exacerbated by poor policy choices made in past decades. Today it is recognized that developments should mix people from different backgrounds and income levels in order to not create neglected "problem neighborhoods".