Why indeed. No nation wants to back its currency with gold or silver, which naturally constrains unlimited creation of new debt. A gold, or in Mexico's case, silver backing would have to be dragged kicking and screaming out of the powers that be by workers sick and tired of sweating their asses off in mines and then being paid in depreciating paper. Yes, it has happened before, but modern Big Brother technology makes it much harder for real leaders acting on behalf of the miners to stand up.
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