Federal Reserve Chairman Ben S. Bernanke and his fellow policy makers will probably forge ahead with their unprecedented bond buying when they meet next week, even as they pick up a debate that began in December on when to end the purchases.

The job market has yet to show the “substantial” gains Bernanke said he wants to see before halting asset purchases. Unemployment has persisted at 7.8 percent or higher since January 2009 while Bernanke held the main interest rate near zero and expanded the Fed’s assets to a record $2.97 trillion. Meanwhile, all 19 Federal Open Market Committee participants see no immediate threat from inflation, now at 1.4 percent.