It is definitely true that cities require many income levels to be sustainable -- preventing monoculture is not just a kind of cultural bias but it is sound eco

It is definitely true that cities require many income levels to be sustainable -- preventing monoculture is not just a kind of cultural bias but it is sound economic strategy to keep your city vital and desirable over the long term. There is so much accrued capital into wealthy hands across the world with need to find profitable parking -- allowing your city to become a real estate bubble in service to investment funds is trading short term gains for long term losses.