U.S. Fed Chairman Ben S. Bernanke

U.S. Fed Chairman Ben S. Bernanke

Andrew Harrer/Bloomberg

Ben S. Bernanke, chairman of the U.S. Federal Reserve. Even though Bernanke said Dec. 12 that the transition to economic thresholds “doesn’t change our mid-2015 expectation,” money-market-derivatives traders since have accelerated their time frame for policy tightening.