US Federal Reserve policymakers expressed broad support last month for the Fed's plan to buy bonds to support the US economy.
But they differed over how long to keep buying bonds to drive down long-term interest rates.
Minutes of the Fed's December policy meeting show that some of the 12 voting members thought the bond purchases would be warranted through the end of this year.
Others felt the purchases should be slowed or stopped altogether before the end of 2013.
This group was concerned that the bond buying is keeping rates so low for so long that it could encourage speculative buying of risky assets.
The Fed ended up approving open-ended purchases of $85 billion a month in Treasurys and mortgage bonds to replace an expiring bond-purchase plan and maintain its level of bond purchases.
The minutes covered the Fed's December 11-12 meeting. In a statement after the meeting, the Fed said it planned to keep a key interest rate at a record low even after unemployment falls close to a normal level - which it said might take three more years.
As long as the outlook for inflation is mild, the Fed said it could keep short-term rates near zero at least until unemployment drops below 6.5%. The unemployment rate in November was 7.7% and the US government will release the rate for December later today. The statement was approved 11-1.
Jeffrey Lacker, president of Federal Reserve Bank of Richmond, objected for the eighth time this year. Lacker has said he thinks the job market is being slowed by factors beyond the Fed's control. And he says further bond purchases risk worsening future inflation.
The minutes showed that even though all but one voting member backed the Fed's continued bond purchases, the officials were divided over how long the purchases should continue.
"A few" thought the purchases should continue through 2013, the minutes said. A few others favoured the purchases but did not specify how long they should go on. And several others thought the bond buying should probably stop before the end of the year.
The Fed's meeting last month occurred as Congress and the Obama administration were locked in furious negotiations to resolve the fiscal cliff - the steep tax hikes and spending cuts that were to kick in this month without a deal.
The minutes said Fed officials saw the uncertainty over the fiscal cliff as a significant threat to the economy. The deal Congress reached this week avoided the fiscal cliff. It raised taxes on the wealthiest Americans while preserving the Bush-era income tax cuts on income under $400,000 for individuals and under $450,000 for households.
Chairman Ben Bernanke warned at a news conference after last month's meeting that no Fed actions could outweigh the damage that would result if the economy fell off the fiscal cliff. Congress' agreement this week was probably roughly in line with what Fed officials had expected, private economists say.
As a result, they expect no changes soon to the Fed's policies. Its federal funds rate, a benchmark for many consumer and business loans, has remained near zero since December 2008.
Critics of bond purchases have raised concerns that keeping interest rates at ultra-low levels for an extended period of time risks distorting financial market decisions. They worry that when the Fed finally begins raising rates, panic selling of stocks and bonds might ensue.
At its next policy meeting on January 29-30, the Fed is also expected to reaffirm its plan to preserve ultra-low rates until unemployment hits 6.5% as long as the inflation outlook is not more than a half percentage point above its 2% target.
Bernanke made it clear that even after unemployment dips below 6.5%, the Fed might decide that it needs to keep stimulating the economy. Other factors will also shape the Fed's policy decisions, he said. In forecasts it updated last month, the Fed said it expected the economy to grow between 2.3-3% this year.
Bernanke said that estimate assumed that Congress' budget deal would include some tax increases and spending cuts. The Fed's outlook for economic growth is slightly higher than many private economists expect but is achievable
