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Low Inflation Bends the Phillips Curve

Joseph Gagnon and Christopher Collins ()

No WP19-6, Working Paper Series from Peterson Institute for International Economics

Abstract: The Phillips curve, which traces out a negative relationship between inflation and unemployment, has undergone tremendous changes over more than 100 years. Some researchers argue that the slope of the curve in the United States fell substantially around 20 years ago so that unemployment now has little or no effect on inflation. This paper shows that another hypothesis is equally consistent with the data: The Phillips curve may be nonlinear when inflation is low, with the economy having operated in the flat region of the curve for most of the past 20 years. The next few years may be decisive in the debate between these hypotheses, as unemployment has returned to a range in which a nonlinear curve ought to display significant steepness. A flat Phillips curve implies little change in inflation going forward, but a nonlinear curve implies moderate increases in inflation over the next few years.

Keywords: Non-accelerating inflation rate of unemployment (NAIRU); unemployment rate (search for similar items in EconPapers)
JEL-codes: E31 (search for similar items in EconPapers)
New Economics Papers: this item is included in nep-mac
Date: 2019-04
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