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Is the Phillips Curve Really a Curve? Some Evidence for Canada, the United Kingdom, and the United States

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Listed:
  • Guy Debelle

    (International Monetary Fund)

  • Douglas Laxton

    (International Monetary Fund)

Abstract

Previous tests for convexity in the Phillips curve have been biased because researchers have employed filtering techniques for the nonaccelerating inflation rate of unemployment (NAIRU) that have been fundamentally inconsistent with the existence of convexity. This paper places linear and nonlinear models of the Phillips curve on an equal statistical footing by estimating model-consistent measures of the NAIRU. After imposing plausible restrictions on the variability in the NAIRU, we find that the nonlinear model fits the data best. The implications for the macro-economic policy debate are that policymakers who are unsuccessful in stabilizing the business cycle will induce a higher natural rate of unemployment.

Suggested Citation

  • Guy Debelle & Douglas Laxton, 1997. "Is the Phillips Curve Really a Curve? Some Evidence for Canada, the United Kingdom, and the United States," IMF Staff Papers, Palgrave Macmillan, vol. 44(2), pages 249-282, June.
  • Handle: RePEc:pal:imfstp:v:44:y:1997:i:2:p:249-282
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    JEL classification:

    • C51 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Model Construction and Estimation
    • E31 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Price Level; Inflation; Deflation
    • E52 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Monetary Policy

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