The head of the San Francisco Federal Reserve Bank on Tuesday said he would be open to another of round asset purchases if inflation trends were to fall significantly short of the U.S. central bank's target. Although he said it would take a big shift in the U.S. economic outlook for the Fed to restart its bond buying, John Williams said the possibility of a new downturn in Europe and other global economic woes pose a risk to the United States. "If we really get a sustained, disinflationary forecast ... then I think moving back to additional asset purchases in a situation like that should be something we should ... (full story)