Should borders be open? Essential, irrelevant–or even more so, a “fundamental freedom?” The notable developmental economist Paul Collier makes the case that migration can cause economic harm, contrary to some economic arguments:
Migration is good for poor countries, but not in every form, and not in unlimited amounts. The migration that research shows is unambiguously beneficial is the kind in which young people travel to democracies like America for higher education and then go home. Not only do these young people bring back valuable skills directly learned in the classroom; they bring back political and social attitudes that they have assimilated from their classmates. Their skills raise the productivity of the unskilled majority, and their attitudes accelerate democratization.