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, will ultimately buy a total of $600 billion in mortgage bonds and $545 billion in Treasuries in the round of bond buying that began in September, according to the median of responses in the March 13-18 survey.