[jrumbut]

> Ok. So why does that happen? It happens basically everywhere in the world

This is a great observation, if a problem is occurring all over the place maybe the solution isn't simple.

The cool stuff in these cities is highly centralized and just building more housing a little further out doesn't spread it automatically.

If you build a high rise apartment tower in Yonkers it might not sell. Move much loser to Manhattan and you run into all the problems of building in an area that's already pretty dense.