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Inside the central bank, however, debate is once again shifting from whether the Fed should do more to stimulate the economy to when it should start doing less.

Proponents of strong action to reduce unemployment won a series of victories last year, culminating in December when the Fed announced that it would hold short-term interest rates near zero at least until the unemployment rate fell below 6.5 percent. The rate was 7.8 percent in December.

To accelerate that process, the Fed also said it would increase its holdings of Treasury securities and mortgage-backed securities by $85 billion each month until it sees clear signs of strength in the job market.

The Fed is expected to affirm both policies on Wednesday. The Fed's chairman, Ben S. Bernanke, said this month that the persistence of high unemployment "motivates and justifies" the efforts.

The looming question is how much longer the asset purchases will continue.

The officials who led the push for stronger action have turned to defending the need to continue asset purchases for as long as possible, while those who opposed the policy are pressing for an early end date.

Eric Rosengren, president of the Federal Reserve Bank of Boston, was among the most outspoken advocates for asset purchases last year. In a speech earlier this month, he said that the Fed's efforts to suppress interest rates were producing clear benefits, increasing sales of homes and cars.

"I consider it imperative that monetary policy continue to actively support the economy at present, since we continue to have an unacceptably high unemployment rate while, at the same time, inflation is undershooting the Federal Reserve's 2 percent target," said Mr. Rosengren, who holds a rotating seat this year on the 12-person Federal Open Market Committee.

Critics of the Fed's efforts initially warned that the purchases would reduce the central bank's ability to control inflation. Increasingly, they also have emphasized that the purchases could undermine the stability of financial markets.

Esther George, the president of the Federal Reserve Bank of Kansas City, said in a speech this month that the Fed's efforts to push down interest rates were driving up the price of farmland, junk bonds and other risky investments.

Ms. George, who holds a vote on the policy-making committee this year, said that the eventual sale of the Fed's holdings also could disrupt markets.

"Like others, I am concerned about the high rate of unemployment, but I recognize that monetary policy, by contributing to financial imbalances and instability, can just as easily aggravate unemployment as heal it," she said.

Many prominent economists outside the Fed continue to argue that the central bank should be acting even more forcefully to stimulate the economy, but that view has gained little traction inside the central bank.

Narayana Kocherlakota, the president of the Federal Reserve Bank of Minneapolis, is the only official who has publicly endorsed stronger action.

"Monetary policy is currently not accommodative enough," Mr. Kocherlakota said, noting that unemployment is too high while the pace of inflation is too low — below the 2 percent annual pace that the Fed considers healthy.

Mr. Kocherlakota said the Fed should announce its intention to keep short-term interest rates near zero until the unemployment rate falls below 5.5 percent, rather than the 6.5 percent threshold the central bank adopted in December.

The Fed deliberately left the duration of the asset purchase program as an open question, in contrast to the specific interest-rate threshold.

It said only that it wanted to see "substantial improvement" in the labor market, though officials have made it clear they also expect to suspend asset purchases well before the unemployment rate reaches the 6.5 percent line.

Mr. Bernanke explained at a December news conference that the Fed wanted to retain greater flexibility because asset purchases are a relatively untested strategy.

"We'll be learning over time about how efficacious they are, about what costs they may carry with them in terms of unintended consequences," he said.

But the discussion already has begun to swing toward informal thresholds.

Mr. Rosengren said last year that the Fed should certainly continue the purchases until the unemployment rate declines at least below 7.25 percent.

James Bullard, president of the Federal Reserve Bank of St. Louis and another voting member of the committee this year, wrote this month that "there is no simple answer to this question" of when the Fed should stop buying bonds.

Then he provided one, telling CNBC that he expected the unemployment rate to drop to near 7 percent by the end of the year and that it would then be appropriate for the Fed to consider suspending its program of asset purchases.