And the solution to that would be to make it affordable to move in the first place. But more than likely is that they're stuck in place because they've a hard time finding work elsewhere, and that they can't finance the move.
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The usual joke is that it's called the American Dream because you have to be asleep to believe it.
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It's used as a carrot constantly dangled out of your reach, to say that if people really just want to, they can. The reality however is quite different.