As I say, Libertarians are good at showing how silly leftists are on this point, and in insisting that magic does not produce everything. They explain that how money is distributed also determines how much money gets produced. So far, so good. So the Libertarian says that all it has to do is redistribute it. He says Mexican labor is worth more on this side of the border than on the Mexican side, so you should let all the Mexicans into the United States, and everything will be fine.
Leftists say that the only reason one person has more money than another does is because of Magic.
Libertarians say that Mexicans have a lower per capita income than Americans because of Magic, not because they are doing anything wrong. Libertarians insist that third worlders should pour into America, because they bring in cheap labor, which is worth as much as our expensive labor. But labor is not all they bring in. They bring in votes. They bring in the same votes that produce the public policy that makes labor cheap in their own countries.