The most plausible argument for mass immigration would be something like factor efficiency plus Tiebout competition. Labor mobility improves people’s lives in the short run by letting labor move to where it’s most productive, a straightforward implication of welfare economics. It also improves lives in the long run by letting . . .
“The art of Economics,” says Henry Hazlitt, “consists in looking not merely at the immediate, but at the longer effects of any act or policy.” This is true not only for the economic effects of policy, but also for the political effects of policy. These longer effects in the political . . .