That's interesting. I've never lived anywhere where that's a problem, at least not to that degree. The places I've lived have low costs of living with the wage disparity holding most people down. A truly urban city where half the people are in a high rise, like myself, has its problems too. Which is what the NIMBYs are worried about I would presume. Tough to scale transportation and everything else around it. It really takes one of the older cities that were designed from nearly day-one to be densely populated. Everything is already in place. For example here all the roads are mostly perfectly square making for efficient movement and trains are the heartbeat of the city.