Communism

It is the same inside the US. Those "poor" clapped-out neighborhoods actually contribute the most to the economy of their administrative areas. Their people mostly get up and go to work every day just like everyone else, they just get paid dogshit (both in wages and in government services) while they're working hard to make sure all the suburbanites can have all the services they like to have while they're working their marketing jobs or whatever. And it doesn't flow at all the other way.