U.S. Federal Reserve Chairman Ben S. Bernanke

U.S. Federal Reserve Chairman Ben S. Bernanke

Joeff Davis/Bloomberg

Ben S. Bernanke, chairman of the U.S. Federal Reserve, is counting on Treasuries to contain borrowing costs as the central bank buys $85 billion a month in securities to sustain the economic recovery that lifted U.S. consumer confidence to the highest in almost six years.