The financial crisis was not caused by monetary policy Many have claimed that excessively easy monetary policy by the Federal Reserve after 2001 helped cause a bubble in house prices in the U.S., a bubble whose inevitable bursting proved to be a major source of the financial crisis. 5 However, as I see it, the crisis was mainly caused by factors that had very little to do with monetary policy and were mostly due to background macro conditions, distorted incentives in financial markets, regulatory and supervisory failures (also when central banks have been responsible for regulation and supervision), information problems and some specific circumstances, including the U.S. housing policy to support home ownership for low-income households. 6 The macro conditions preceding the crisis included low world real interest rates associated with global imbalances, as well as the Great Moderation, with a long period of very stable growth and stable low inflation, which led to a systematic underestimation of risk and very low risk premia in financial markets. There were distorted incentives for commercial and investment banks to increase leverage that were made possible by lax regulation and supervision and the lack of an appropriate bank resolution regime. There were also distorted  3  The idea that inflation targeting implies that the inflation forecast can be seen as an intermediate target was introduced in King (1994). The term “inflation-forecast targeting” was introduced in Svensson (1997), and the term “forecast targeting” in Svensson (2005). See Woodford (2007a, b) for more discussion and analysis of forecast targeting.

Real interest rates were low to a large extent because of global imbalances, the global saving glut and investment shortage. I believe that somewhat higher interest rates would have made little or no difference. Empirical evidence indicates that only a small portion of house-price increases can be attributed to monetary policy. 10 Bernanke (2010) shows that the recent phenomenon of a higher share of adjustable-rate mortgages was unlikely to have significantly increased the sensitivity of house prices to monetary policy. The availability of new, more exotic mortgage types mattered much more for initial mortgage payments than the level of shortterm interest rates. In my view, interest rates would probably have had to be raised very high so as to cause considerable damage to the real economy in order to stop the credit growth and housing boom. 11 That could have thrown the U.S. right into Japanese-style deflation and eventually a liquidity trap. Certainly, higher interest rates would have had no impact on the regulatory problems, distorted incentives and information problems mentioned above  7  I remember this period very vividly, because I was fortunate to have the opportunity to discuss and debate the problems of current monetary policy, deflation and liquidity traps in a group of great economists at Princeton University that included Ben Bernanke (before he left to be a Governor on the Federal Reserve Board), Alan Blinder, Paul Krugman, Chris Sims and Michael Woodford. 8  See Svensson (2003) for a discussion of policy options before and in a liquidity trap.