The Federal Reserve and academics who give it advice are rethinking the proposition that the Fed cannot and should not try to prick financial bubbles.

"[O]bviously, the last decade has shown that bursting bubbles can be an extraordinarily dangerous and costly phenomenon for the economy, and there is no doubt that as we emerge from the financial crisis, we will all be looking at that issue and what can be done about it," Fed Chairman Ben Bernanke said this week.

The bursting of this decade's housing bubble, which was accompanied by a bubble of cheap credit, has wrought inestimable economic damage. The U.S. economy was faltering before the crisis in credit markets recently intensified, rattling financial markets and sending home prices down further. Even if the government's decision to take stakes in major banks works, it could take weeks for money to flow freely again.

"A recession at least of the magnitude of 1982 is quite likely," said ITG economist Robert Barbera. The recession that ended in 1982 lasted 16 months -- twice as long as the 1991 and 2001 recessions -- and saw the unemployment rate rise to 10.8% from 7.2%.

While it is too soon to pronounce an about-face in Fed thinking, policy makers' views clearly are evolving. The Federal Reserve's longtime line on financial bubbles has been that they were impossible to identify. Even if the central bank could identify a bubble, policy makers said, trying to lance it would be far worse for the economy than letting the bubble run its course and dealing with the consequences.