The world runs on dollars. It's the most commonly used currency in international transactions, an important reserve for central banks around the world, and a safe haven in troubled times. There are, however, some countries trying to move away from King Dollar, so what effect is it having? Bloomberg's Senior Washington Correspondent Saleha Mohsin wrote a book on the subject, called 'Paper Soldiers'. She joins Stephen Carroll to discuss.  See omnystudio.com/listener for privacy information.