[elgabogringo]

Wow, this shows that you don't think very highly of low-income people. I think a community of retired russian immigrants would be very pleasant.

[sephlietz]

I think they are referring to the effects of concentrated poverty. https://en.wikipedia.org/wiki/Concentrated_poverty

[ScaryRacoon]

Not at all. The housing administration had some discriminatory practices in the past that did much of what the original suggestion was. It was a disaster. You want a community to be as diverse as possible across any sort of metric (income, race, religion, etc).