From Fed Chaiman Ben Bernancke’s recent speech on monetary policy: “In sum, both the benefits and costs of nontraditional monetary policies are uncertain; in all likelihood, they will also vary over time, depending on factors such as the state of the economy and financial markets and the extent of prior Federal Reserve asset purchases. Moreover, nontraditional policies have potential costs that may be less relevant for traditional policies. For these reasons, the hurdle for using nontraditional policies should be higher than for traditional policies. At the same time, the costs of nontraditional policies, when considered carefully, appear manageable, implying that we should not rule out the further use of such policies if economic conditions warrant.”
Later, in the same speech: “As I have discussed today, it is also true that nontraditional policies are relatively more difficult to apply, at least given the present state of our knowledge. Estimates of the effects of nontraditional policies on economic activity and inflation are uncertain, and the use of nontraditional policies involves costs beyond those generally associated with more-standard policies. Consequently, the bar for the use of nontraditional policies is higher than for traditional policies. In addition, in the present context, nontraditional policies share the limitations of monetary policy more generally: Monetary policy cannot achieve by itself what a broader and more balanced set of economic policies might achieve; in particular, it cannot neutralize the fiscal and financial risks that the country faces. It certainly cannot fine-tune economic outcomes.”
–Fed Chairman Ben Bernancke (see entire speech)