[treeface9000]

The answer is pretty simple... how can someone on a low income live in a city? When the cost of rent is more than you make in a month. It's just not possible. Take New York City -- the average rent in Manhattan is over $5000 a month. If you consider low income to be 50k/year. Rent alone would have you running a deficit of 10k/year.

[whall6]

Right so the question is, when did this become the case? When did cities become unaffordable and why?

[hdlothia]

https://graylinegroup.com/urbanization-catalyst-overview/