[dionidium]

> On the other hand, I see no reason to think that "demand for good locations is increasing".

I think demand pretty clearly is increasing and my hunch is that it's a technological effect. † The internet didn't make place irrelevant, as many thought it would; in fact, it had the opposite effect in that it made it a lot easier to move to the most desirable cities. You can scope out neighborhoods on Street View; shop for new apartments on Street Easy or Craigslist; endlessly research the target city, apply for your new job, and complete the first round of interviews -- all on the internet, from the comfort of wherever you live now.

(And, not for nothing, it's also a lot cheaper to fly back and forth today, once you get to that point in your transition.)

† In some abstract, Platonic sense, San Francisco is probably no more desirable than it might have been in 1971, but, as I try to argue above, a Clevelander then would have had a much, much harder time manifesting that desire than today. And as more and more people realize this desire, the attraction grows as if by accretion.