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Brexit supporters in London last year. Since Boris Johnson, another supporter, became prime minister last week, the British pound has lost nearly 3 percent of its value against the dollar and the euro.CreditCreditAndrew Testa for The New York Times

LONDON — The British pound has long possessed a mystique that transcends its marginal role in the global economy, conjuring memories of its dominance in the imperial age. But lately the currency has devolved into a sign of Britain’s diminishing fortunes in a present dominated by Brexit.

As the country slides toward the European Union’s exits, the latest pressure on its currency comes in the form of the new prime minister, Boris Johnson. Mr. Johnson has insisted he is prepared to accept the expensive chaos of leaving the European Union without a deal governing future relations. Read more by clicking: The New York Times