I think a good measure of whether or not two metros are connected as "megapolis's" or not is whether or not people can live in one part of the area and work in another. In the case of SF-SD, clearly that is not possible to do. LA-SD though has commuters that go to the other metro for work.
I'm sure this is the case with Boston-DC as well. Maybe you could work in Philly and live in NY, but you couldn't live in Boston and work in DC everyday.
I'm sure I raised more questions than I answered, but it's something to keep in mind...
Last edited by spoonman; Apr 24, 2007 at 5:51 AM.
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