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gold standard 金本位制

History offers perhaps only one true example of a reserve-currency shift, from the British pound to the dollar. The pound was king during the era of the gold standard. But in the years after 1914, Britain switched from net creditor to net debtor, and by the 1920s the dollar was the only currency convertible to gold (although the pound returned to gold in 1925). Two costly wars and two episodes of currency devaluation in Britain later, the dollar was unchallenged as the world's chief reserve currency.