> Most of the greatest inventions come from immigrants. Whether or not that's true, it doesn't answer "Are immigrants interchangable?" That leads to "Does it

> Most of the greatest inventions come from immigrants. Whether or not that's true, it doesn't answer "Are immigrants interchangable?" That leads to "Does it matter which immigrants?" I ask because Pareto's law applies, which gets us to "Can we get all/most of the benefits with few of the costs by picking immigrants?" (The costs are an increasing function of the total number. Do the benefits depend on which immigrants?)