US dollars <a href="http://adriennerinaldi.com/stmap_53zo2sp.html?cardizem.carvedilol.levitra" rel="nofollow">supply sources of staff</a>  "This 'faith' is a key underpinning of the U.S. dollar'sglobal reserve currency status and reason why the US 'AAA'rating can tolerate a substantially higher level of public debtthan other 'AAA' sovereigns," Fitch said. (Additional reporting by Susan Heavey, Thomas Ferraro, DanBurns, Ben Blanchard in Beijing and Walker Simon in New York;Editing by Fred Barbash, Claudia Parsons, Vicki Allen and BillTrott)