[em-bee]

There should be social housing in every ZIP code

exactly. it has been shown elsewhere that one problem that makes it difficult for people to escape poverty is that everyone around them is poor too. as long as you live there there is an invisible ceiling in how much you can improve your life as an individual/family. people who were able to move to a better neighborhood found it much easier to improve. mixed housing avoids that poor neighborhood trap.

the same btw, is true for the integration of immigrants.