Yellen, Janet

This raises the broader—and very contentious—issue of whether monetary policy should seek to lean against potentially dangerous swings in asset prices. The answer is far from clear, because the use of monetary policy for these ends necessarily compromises the attainment of other macroeconomic goals. Because such use of monetary policy is costly, high priority should be assigned to developing regulatory tools to address systemic risk. Even so, the crisis of the past two years has prompted many of us to reexamine the widely held view that monetary policy should respond to asset prices only to the extent that they influence the anticipated trajectories of inflation and unemployment.  Further research into the connections among monetary policy, the banking and financial sectors, and systemic risk is needed to help answer this question.11