That is something we do. Almost all cities, even very progressive ones, have a long history of redlining, which is still being dismantled today. The biases are

That is something we do. Almost all cities, even very progressive ones, have a long history of redlining, which is still being dismantled today. The biases are racial and on income, which are strongly commingled from even heavier handed discrimination in the past. The current separation of rich white and poor black/brown absolutely did not and does not fall out of a free market without consistent, long term, and deliberate racial action. Frankly, this is completely ignored by most neoliberal treatments of the housing issue.