Exactly, money can move places faster than housing markets can respond. Some areas are unwilling to increase density, and some areas will be willing. I suspect

Exactly, money can move places faster than housing markets can respond. Some areas are unwilling to increase density, and some areas will be willing. I suspect that there is a practical physical and economic limit to the increase of density that many cities will be willing or able to scale to - and some may scale to destroy that quality that made them desirable places to live in the first place. There is a reason that not all cities make it to New York City level density.