When wealthy people go move into walled off gardens, yes they price everything to keep people out. But in a mixed community, you end up with mixed and middle-of-the-road retail prices. We’re not talking about dropping two impoverished people into Park Avenue; we’re talking about a community that is reflective of the county’s socio-economic distribution.

Concentrating people of little means into a small area ostracizes them and removes them from areas with opportunity, arguably making them more desperate.

Poor people need to be mixed in with everybody else. The areas with the highest rates of social mobility in the US have the most mixing between classes. People in need will get support from people of means if they are seen as their neighbors and community members. And interacting with middle/ upper class families demonstrates to poorer kids how to manage money, how to seize opportunity, how to walk the walk and talk the talk of affluence, etc.