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Can Supply Shocks be Inflationary with a Flat Phillips Curve?

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  • Jean-Paul L’Huillier
  • Gregory Phelan

Abstract

Empirical estimates find that the relationship between inflation and the output gap is close to nonexistent—a so-called flat Phillips curve. We show that standard pricing frictions cannot simultaneously produce a flat Phillips curve and meaningful inflation from plausible supply shocks. This is because imposing a flat Phillips curve immediately implies that the price level is also rigid with respect to supply shocks. In quantitative versions of the New Keynesian model, price markup shocks need to be several orders of magnitude bigger than other shocks in order to fit the data, leading to unreasonable assessments of the magnitude of the increase in costs during inflationary episodes. Hence, we propose a strategic microfoundation of price stickiness in which prices are sticky with respect to demand shocks but flexible with respect to supply shocks (Working Paper no. 23-03).

Suggested Citation

  • Jean-Paul L’Huillier & Gregory Phelan, 2023. "Can Supply Shocks be Inflationary with a Flat Phillips Curve?," Working Papers 23-03, Office of Financial Research, US Department of the Treasury.
    • Handle: RePEc:ofr:wpaper:23-03
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    References listed on IDEAS

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    1. N. Gregory Mankiw & Ricardo Reis, 2002. "Sticky Information versus Sticky Prices: A Proposal to Replace the New Keynesian Phillips Curve," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 117(4), pages 1295-1328.
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    4. Guido Ascari & Luca Fosso, 2021. "The Inflation Rate Disconnect Puzzle: On the International Component of Trend Inflation and the Flattening of the Phillips Curve," Working Paper 2021/17, Norges Bank.
    5. V. V. Chari & Patrick J. Kehoe & Ellen R. McGrattan, 2009. "New Keynesian Models: Not Yet Useful for Policy Analysis," American Economic Journal: Macroeconomics, American Economic Association, vol. 1(1), pages 242-266, January.
    6. Jordi Galí, 2015. "Monetary Policy, Inflation, and the Business Cycle: An Introduction to the New Keynesian Framework and Its Applications Second edition," Economics Books, Princeton University Press, edition 2, number 10495.
    7. Jonathon Hazell & Juan Herreño & Emi Nakamura & Jón Steinsson, 2022. "The Slope of the Phillips Curve: Evidence from U.S. States," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 137(3), pages 1299-1344.
    8. Nakamura, Emi & Steinsson, Jón, 2011. "Price setting in forward-looking customer markets," Journal of Monetary Economics, Elsevier, vol. 58(3), pages 220-233.
    9. Drago Bergholt & Francesco Furlanetto & Etienne Vaccaro-Grange, 2023. "Did monetary policy kill the Phillips Curve? Some simple arithmetics," Working Paper 2023/2, Norges Bank.
    10. Adam Hale Shapiro, 2022. "How Much Do Supply and Demand Drive Inflation?," FRBSF Economic Letter, Federal Reserve Bank of San Francisco, vol. 2022(15), pages 1-06, June.
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    Cited by:

    1. Pablo Cuba-Borda & Jean-Paul L'Huillier, 2025. "Inflation is a Supply Phenomenon," Working Papers 137, Brandeis University, Department of Economics and International Business School.
    2. Harding, Martín & Lindé, Jesper & Trabandt, Mathias, 2023. "Understanding post-COVID inflation dynamics," Journal of Monetary Economics, Elsevier, vol. 140(S), pages 101-118.
    3. Ginters Buss & Guido Traficante, 2025. "The Return of Inflation: Look-Through Policy Under Incomplete Information," Working Papers 2025/02, Latvijas Banka.

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    More about this item

    JEL classification:

    • 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
    • E58 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Central Banks and Their Policies

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