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Trend Inflation and the Nature of Structural Breaks in the New Keynesian Phillips Curve

Author

Listed:
  • Chang-Jin Kim

    (Department of Economics, University ofWashington, and Department of Economics, Korea University)

  • Pym Manopimoke

    (Department of Economics, University of Kansas)

  • Charles R. Nelson

    (Department of Economics, University of Washington)

Abstract

In this paper, we investigate the nature of structural breaks in inflation by estimating a version of the New Keynesian Phillips curve (NKPC) in the presence of a unit root in inflation. We show that, with a unit root in inflation, the NKPC implies an unobserved components model that consists of three components: a stochastic trend component, a component that depends upon current and future forecasts of real economic activity, and a stationary component which is potentially serially correlated (or a component of inflation that is not explained by the conventional forward-looking NKPC). Our empirical results suggest that, with an increase in trend inflation during the Great Inflation period, the response of inflation to real economic activity decreases and the persistence of the inflation gap increases due to an increase in the persistence of the unobserved stationary component. These results are in line with the predictions of Cogley and Sbordone (2008), who show that the coefficients of the NKPC are functions of time-varying trend inflation.

Suggested Citation

  • Chang-Jin Kim & Pym Manopimoke & Charles R. Nelson, 2013. "Trend Inflation and the Nature of Structural Breaks in the New Keynesian Phillips Curve," Discussion Paper Series 1305, Institute of Economic Research, Korea University.
    • Handle: RePEc:iek:wpaper:1305
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    References listed on IDEAS

    as
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    JEL classification:

    • C32 - Mathematical and Quantitative Methods - - Multiple or Simultaneous Equation Models; Multiple Variables - - - Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models; Diffusion Processes; State Space Models
    • E12 - Macroeconomics and Monetary Economics - - General Aggregative Models - - - Keynes; Keynesian; Post-Keynesian; Modern Monetary Theory
    • E31 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Price Level; Inflation; Deflation

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