LAST week Ben Bernanke appeared before Congress, setting off a discussion over whether the president should reappoint him as chairman of the Federal Reserve when his term ends next January. Mr. Bernanke deserves to be reappointed. Both the conventional and unconventional decisions made by this scholar of the Great Depression prevented the Great Recession of 2008-2009 from turning into the Great Depression 2.0.

Mr. Bernanke understands that in the Great Depression, the collapse of the money supply and the lack of monetary stimulus during contractions worsened the country’s economic free fall. This lesson has paid off. Mr. Bernanke’s decision to keep interest rates low and encourage lending has, for now, averted the L-shaped near depression that seemed highly likely after the financial collapse last fall.

To be sure, an endorsement of Mr. Bernanke’s reappointment comes with many caveats. Mr. Bernanke, a Fed governor in the early part of this decade, supported flawed policies when Alan Greenspan pushed the federal funds rate (the policy rate set by the Fed as its main tool of monetary policy) too low for too long and failed to monitor mortgage lending properly, thus creating the housing and credit and mortgage bubbles.

Image Credit... Vivienne Flesher

He and the Fed made three major mistakes when the subprime mortgage crisis began. First, he kept arguing that the housing recession would bottom out soon (it has not bottomed out even three years later). Second, he argued that the subprime problem was a contained problem when in reality it was a symptom of the biggest leverage and credit bubble in American history. Third, he argued that the collapse in the housing market would not lead to a recession, even though about one-third of jobs created in the latest economic recovery were directly or indirectly related to housing. Mr. Bernanke’s analysis was mistaken in several other important ways. He argued that monetary policy should not be used to control asset bubbles. He attributed the large United States current account deficits to a savings glut in China and emerging markets, understating the role that excessive fiscal deficits and debt accumulation by American households and the financial system played.