This is a good time to remember that without immigration the US will only have 5% of the top people in each field. http://paulgraham.com/95.html
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The whole essay is based on that principle.
That's the basis of the idea that if you have x% of the population, (100 - x)% of the best people will be born elsewhere.
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this is of course ceteris paribus, but things like education and internet access is hard to discount.
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if you look at human history, great things happened whenever brightness was concentrated. Da Vinci's Florence, etc
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that's assuming talent is evenly distributed. You have to be white, Christian and American to be talented... Don't you?
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Not sure that he best moral ground for immigration is to deprive other countries of their "best(!) people".
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the world's best shd be allowed to go wherever they think best serves them. Many world leaders study abroad, for eg
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