It can't be due to fundamental skill, though! That same engineer's earnings statistically triple upon moving to the US, which is why we should allow more of the

It can't be due to fundamental skill, though! That same engineer's earnings statistically triple upon moving to the US, which is why we should allow more of them in: people are more productive in the US, and we all benefit from their productivity (most obviously fiscally, but less obviously through products that wouldn't exist in the counterfactual).