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Money is different from all other commodities: other things being equal, more shoes, or more discoveries of oil or copper benefit society, since they help alleviate natural scarcity. But once a commodity is established as a money on the market, no more money at all is needed. Since the only use of money is for exchange and reckoning, more dollars or pounds or marks in circulation cannot confer a social benefit: they will simply dilute the exchange value of every existing dollar or pound or mark.