Federal Reserve Chairman Ben Bernanke during a news conference in June. Financial markets reacted to comments he made then by selling off bonds and stocks. Alex Wong/Getty Images hide caption

itoggle caption Alex Wong/Getty Images

Monument to headier times: The euro logo outside the European Central Bank in Frankfurt. The International Monetary Fund has warned of possible deflation in parts of Europe. Frank Rumpenhorst/AFP/Getty Images hide caption

itoggle caption Frank Rumpenhorst/AFP/Getty Images