Letters of exchange, early predecessors of paper cash instead of coins, first developed by guilds in northwestern Shanxi. By the thirteenth century, paper money had eclipsed coins.
Paper money is referred to as fiat money in the US. This indicates that its only actual worth is as a recognized form of transaction. This was not the case prior to 1971; the Federal Reserve mandated that a specific amount of gold be used to back U.S. banknotes.
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