Is one reason for the productivity boost that migrants move from low productivity to high productivity locations? Well, that's a great question. And we as economists are very obsessed with causality versus correlation. So in those studies that you're mentioning, we do a great deal of work to try to convince a reader that it's not that they're following up the former but actually moving the know-how. But overall, I think it's a good example of how we are actually trying to deal with the first one.

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