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Anyone seeking an application of the principle that fame is fleeting need look no further than the assessment of Federal Reserve policy from 2002 to 2005.

At the beginning, capital spending was anemic, and considerable wealth had been destroyed by the equity crash. The recovery from the 1990-91 recession was "jobless," and the current one was following the same script. Moreover, inflation was so distinctly pointed down that deflation seemed a palpable threat.

Keeping the federal-funds rate low for a long time was viewed as appropriately balancing the risks to the Fed's dual objectives of maximum employment and price stability. Indeed, the Fed was seen as extending the stable economic performance since 1983 that had been dubbed the "Great Moderation."

Over the period 2002-2005, the federal-funds rate ran below the recommendation of the policy rule made famous by Stanford Professor John Taylor. No doubt, the Taylor Rule provides important guidance on how that rate should change in response to changes in the two mandated goals of policy. First, it should move up or down by more than any change in inflation. Second, the Fed should respond to changes in resource slack. That is, caring about unemployment is not a sign of weakness in a central banker but rather that of strength in better achieving good results.

The Taylor Rule is less helpful to practitioners of policy in anchoring the level of the federal-funds rate. The rule is fit to experience based on a notion of the rate that should prevail if inflation were at its goal and resources fully employed, which is known as the equilibrium funds rate. That is an important technicality. Using a faulty estimate of the equilibrium funds rate is like flying a plane that is otherwise perfect except for an unreliable altimeter. The exception looms large when flying over a mountainous region.

From 2002 to 2005, the economic landscape appeared especially changeable, with the contours shaped by lower wealth, lingering job losses, and looming disinflation. To Fed officials at the time, this indicated that the equilibrium funds rate was unusually low. Simply, the only way to provide lift to an economy in which resource use was slack and inflation pointed down was to keep policy accommodative relative to longer-term standards.

That was then. Now, policy during the period is seen as fueling a housing bubble.

The Fed is guilty as charged in setting policy to achieve the goals mandated in the law. Fed policy makers cannot be held responsible for the fuel to speculative fires provided by foreign saving and the thin compensation for risk that satisfied global investors. Nor can the chain of subsequent mistakes that drove a downturn into a debacle be laid at the feet of the Federal Open Market Committee of 2002 to 2005. If the results seem less than desirable in retrospect, change the law those policy makers were following, but do not blame them for following prevailing law.

Vincent R. Reinhart is a resident scholar at AEI.