Yeah! Well, another point comes up here too. Do we really need to look at subway lines to find out if rich people live in Manhattan? It seems like you only need income tax returns to answer that one. It's more like, are the stops on subway lines segregated into rich and poor clusters the same way that physical neighborhoods of rich and poor people are segregated on a map? And then speculation as to why or why not is interesting. For SF it's hard to answer, but for New York, well, to build a train track that leaves Manhattan is expensive unless you're going to the Bronx, so you're going to put all the Manhattan stops together.