Vietnam devalued its currency by 5.4 per cent against the dollar yesterday and raised interest rates by a full percentage point in an effort to cut inflation and underpin the beleaguered dong. The dong has come under pressure recently as inflation started climbing and domestic demand, driven by the country's $8bn stimulus programme, drove the current account deficit to close to $2bn a month. It was trading on the grey market at 19,800 to the dollar on Tuesday but came back to 19,500 after the government move. Analysts, however, questioned whether financial markets would believe the latest move had put...