The Fed this week tackled head-on the woes afflicting the world 's top economy but the approach also creates uncertainties , mainly in the form of a weakening dollar and prospects of surging inflation once the economy starts recovering . " This is a historic moment , the start of debasement of the world 's reserve currency , and it feels to many participants that in the grand sweep of history we are witnessing the end of ' Rome ' on the Potomac , " said Alan Ruskin , a RBS strategist in Greenwich .