Earlier quoted context omitted.
It seems to me that the case is exactly the opposite: the talent appears randomly, so the only way to concentrate it is migration.
> the talent appears randomly That's a pretty strong statement, but even if we take it as an axiom, I think that it isn't migration that concentrates it -- people migrate from everywhere to everywhere all the time. I think it has more to do with having gone through some hardship, and (selection bias) having done so successfully, makes people better at taking risks. There's a statistic that says that a huge number (te…
Also, I'm offended by your last sentence. You've obviously not immigrated to america recently. I have, and it wasn't easy, nor was it cheap.