The Federal Reserve sent its clearest signal to date Wednesday that it will keep interest rates low to support the U.S. economy even after the job market has improved significantly.
The Fed said it plans to keep its key short-term rate near zero until the unemployment rate reaches 6.5 percent or less -- as long as expected inflation remains tame. U.S. unemployment is now 7.7 percent.
That plan adds detail to what the Fed had said before: that it expects to keep the rate low until at least mid-2015. For the first time, the Fed is making clear to investors and consumers that it will link its actions to specific economic markers.
"This approach is superior" to setting a timetable for a possible rate increase, Chairman Ben Bernanke said at a news conference.
Bernanke made clear that even after unemployment falls below 6.5 percent, the Fed might decide that it needs to keep stimulating the economy.
Other economic factors will also shape its policy decisions, he said.
In a statement after its final policy meeting of the year, the Fed said it will also keep spending $85 billion a month on bond purchases to drive down long-term borrowing costs and stimulate economic growth.
The Fed will spend $45 billion a month on long-term Treasury purchases to replace a previous bond-purchase program of an equal size. And it will keep buying $40 billion a month in mortgage bonds.
Those purchases, and the Fed's commitment to low rates, are intended to spur borrowing and spending in an economy still growing only modestly 31/2 years after the Great Recession ended.
Still, Bernanke warned that none of the Fed's actions could outweigh the economic pain that would be caused by sharp tax increases and government spending cuts that are set to kick in next month.