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I've been wondering for some time now why people don't currently use gold, silver, platinum, bananas, or whatever as a medium for exchange instead of dollars, euros, yen, etc. Are there laws in place forcing people to trade in dollars? There are plenty of other things available that could be...
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Currency, by definition, is never "hard;" people keep the hard money and spend the least hard. However, the problem is easy if there is a federal system: the central government is mandated to coin both gold and silver coins, the several States adopt one or the other. If someone finds a reef...