[Touche]

Just have to point out that the population density is hard thing to talk about in the U.S. because the reality is that NYC is far more dense that any other city. We talk about a few cities as though they are equals when in reality it's NYC and then a giant dropoff to everyone else.

Also there's a perception of a few places as being the "big cities" even though population has changed a lot over the years. Perception hasn't changed. So even though SF is definitely dense, there are other places that are equally dense, like Miami, Philadelphia, and Louisville that people don't really think of that way. And then there are emerging big cities (but not necessarily dense) like San Antonio that people perceive as being small.