Do you really want to live in a city with no firefighters? No teachers? No students? No janitors? No restaurants? No librarians? No postal workers? No baristas?

Do you really want to live in a city with no firefighters? No teachers? No students? No janitors? No restaurants? No librarians? No postal workers? No baristas? If you "migrate" the people with poor-to-middle-class incomes, your city becomes an empty husk. What is even the point of cities, if we assume most people could never "compete" well enough to live there?