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Because dollars are not real, they can be created at a whim, and while reversing international transfers is not quite so simple, very often that reversal can be achieved (e.g. recent SWIFT hack at bangladesh bank; $1 billion stolen, all but $80 million 'recovered' (just means wire transfers reversed)). Added to that consider that fiat money is insured, so even when transfers can't be reversed, the money can be 'recovered'.