Monetary credibility, inflation, and economic growth.

• Author: Ferguson, Jr., Roger W.

By now it must be universally agreed that low and stable inflation is a primary and essential goal for monetary policy, in large part because we believe it brings stability to financial systems and fosters sustainable economic growth over the longer run. In pursuit of this goal, central banks can report some success. According to the 2005 World Economic Outlook from the International Monetary Fund (IMF 2005), consumer price inflation in the advanced economies over the decade beginning in 1997 looks set to come in at an average annual rate of less than 2 percent, down from 3.5 percent for the previous 10 years. The IMF figures for the United States show a smaller but still substantial decline in headline inflation, from about 3.75 percent to 2.5 percent. The drop in inflation for the nonindustrial economies has been more striking, with average inflation falling from double to single digits. (1)

As someone who started work as a monetary policymaker in 1997, I am happy to acknowledge the accomplishments of many policymakers at the Federal Reserve and in other central banks around the world. Thanks to their success in fighting inflation, the central banking profession enjoys a very high standing. And as a related matter, we might say that monetary credibility, which I would define as the perception in the private sector that central banks will do what it takes to keep inflation under control, is also quite high.

This credibility is hard won, however, and can be easily lost. The Federal Open Market Committee (FOMC) at its November 1, 2005, meeting increased the federal funds rate 25 basis points, to 4 percent, and observed:

The cumulative rise in energy and other costs has the potential to add to inflation pressures; however, core inflation has been relatively low in recent months and longer-term inflation expectations remain contained.... With underlying inflation expected to be contained, the Committee believes that policy accommodation can be removed at a pace that is likely to be measured. Nonetheless, the Committee will respond to changes in economic prospects as needed to fulfill its obligation to maintain price stability [FOMC 2005]. Unfortunately, however, the story over the past 20 years is not so uniformly positive for growth. Again according to IMF figures, growth among the nonindustrial economies appears to have increased to about 5.25 percent in the decade beginning in 1997, compared with growth of 3.75 percent in the previous 10 years. Growth in the United States has also moved slightly higher over the two periods, from 3 percent to 3.25 percent. However, growth in the other industrial economies has softened, to less than 2.5 percent in the recent decade from more than 3 percent in the previous one. This decline reflects slowing in some of the larger economies--Japan, Germany, Italy, and the Netherlands--as well as the effect of the Asian crisis in 1997 on newly industrialized Asian economies. (2)

To me, it is axiomatic that monetary credibility, by reducing the level and variability of inflation, lays the foundations for stronger and more sustained economic growth. In this article, I want to discuss anecdotal and academic evidence for the relationship between monetary policy credibility and economic growth and to do so in two segments: first, the link between monetary policy credibility and inflation performance and, second, the link between inflation performance and longer-run economic growth.

Monetary Policy Credibility and Inflation Performance Outcomes

Does monetary credibility help secure lower inflation, less variable inflation, and inflation that is less sensitive to shocks? Low and stable inflation must start with sound policy--that is, policy that keeps output near potential and offsets shocks to supply and demand appropriately. But beyond that, common intuition and numerous academic journal articles, a few of which I will discuss shortly, suggest that credibility can greatly enhance the virtues of sound policy. When the central bank...