For much of the past two years, the president of the Federal Reserve Bank of Minneapolis has argued that monetary policy could do little to cure high unemployment because shifts in the economy had created a mismatch between workers' skills and available jobs.
But Narayana Kocherlakota's view has changed.
He has become one of the leading voices calling for the Fed to keep interest rates low indefinitely. As long as it isn't causing inflation, he reiterated Wednesday, the central bank "should keep the fed funds rate extraordinarily low until the unemployment rate has fallen below 5.5 percent."
His change of heart reflects a subtle but important shift in how economists answer a very big question: Do we have a struggling economy, or do we have one that's fundamentally changed?
If 8 percent unemployment is the new standard in a new economy, then low interest rates won't lead to jobs for anybody. "If you really believe it's all about structural, frictional unemployment, it really doesn't matter what the Fed does," said Peter Ferderer, who teaches economics at Macalester College in St. Paul.
Unemployment should fall as job openings rise. If both numbers increase, the economy is creating jobs for which there are no workers, while leaving other workers jobless because no openings fit their skills or geography.
In August 2010, American unemployment was 9.6 percent despite a 20 percent rise in job openings over the previous 12 months, and economists began to believe the problem was a labor mismatch.
One of those was Kocherlakota.