Harvard came out with a study last year. They measured people in the lowest quintile of income and compared their success 20 years later depending on how much time they spent with people in other quintiles. It's a massive thing that people intermingle and get to see what other people's lives are like. I think that helps people think about the different choices they have in their life and that they have the same chance as other people.
If you have all affordable housing in one spot, there's not enough diversity of thought. People don't see what their lives could be like. I think the movement towards market and affordable housing together is much healthier.