Social Stigma can be a Contagion.
And getting people out of neighborhoods where it collects seems to be a cure.
Interesting to note that the study actually didn’t support the thesis that environmental conditions would improve things like income or poverty rates, but that housing support to live in more affluent neighborhoods did have a substantial improvement in quality of life.
It seems to me that today there’s more of a stigma attached to simply being poor and living in a poorer neighborhood than asking for, or receiving help. Being in a surrounding that’s materially different doesn’t increase your income,. but it certainly seems to help the dignity and happiness of the families involved.