The map also shows a big link to proximity to Manhattan, though that's not something anyone needed a map to tell them.  One wonders if a good trade for congestion pricing in Manhattan might not be some sort of help in encouraging the other boroughs to have some more robust business centers of their own.  Everyone wants to be around Wall Street or Midtown, and there are historical reasons for that, but in the 21st century proximity of businesses to each other should be at least a little less important, and if more people in the outer boroughs could work closer to where they live, I think it would only be good for everyone involved.