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Does the New Keynesian Model Have a Uniqueness Problem?

Author

Listed:
  • Lawrence Christiano
  • Martin S. Eichenbaum
  • Benjamin K. Johannsen

Abstract

This paper addresses whether non-uniqueness of equilibrium is a substantive problem for the analysis of fiscal policy in New-Keynesian (NK) models at the zero lower bound (ZLB). There would be a substantive problem if there were no compelling way to select among different equilibria that give different answers to critical policy questions. We argue that learnability provides such a criterion. We study a fully non-linear NK model with Calvo pricing frictions. Our main finding is that the model we analyze has a unique E-stable rational expectations equilibrium at the ZLB. That equilibrium is also stable-under-learning and inherits all of the key properties of linearized NK models for fiscal policy.

Suggested Citation

  • Lawrence Christiano & Martin S. Eichenbaum & Benjamin K. Johannsen, 2018. "Does the New Keynesian Model Have a Uniqueness Problem?," NBER Working Papers 24612, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:24612
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    Citations

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    Cited by:

    1. Guido Ascari & Sophocles Mavroeidis & Nigel McClung, 2023. "Coherence without Rationality at the ZLB," DEM Working Papers Series 212, University of Pavia, Department of Economics and Management.
    2. He Nie & Jordan Roulleau-Pasdeloup, 2023. "The promises (and perils) of control-contingent forward guidance," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 49, pages 77-98, July.
    3. Tomohide Mineyama, 2024. "Downward Nominal Wage Rigidity and Determinacy of Equilibrium," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 56(1), pages 305-316, February.
    4. Yasuo Hirose & Takeki Sunakawa, 2019. "Review of Solution and Estimation Methods for Nonlinear Dynamic Stochastic General Equilibrium Models with the Zero Lower Bound," The Japanese Economic Review, Springer, vol. 70(1), pages 51-104, March.
    5. Valerie Cerra & Antonio Fatás & Sweta C. Saxena, 2023. "Hysteresis and Business Cycles," Journal of Economic Literature, American Economic Association, vol. 61(1), pages 181-225, March.
    6. Christopher Gibbs & Nigel McClung, 2023. "Does my model predict a forward guidance puzzle?," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 51, pages 393-423, December.
    7. Ascari, Guido & Mavroeidis, Sophocles, 2022. "The unbearable lightness of equilibria in a low interest rate environment," Journal of Monetary Economics, Elsevier, vol. 127(C), pages 1-17.
    8. repec:zbw:bofrdp:2021_014 is not listed on IDEAS
    9. Martin Eichenbaum, 2023. "On the limits of rational expectations for policy analysis," Canadian Journal of Economics/Revue canadienne d'économique, John Wiley & Sons, vol. 56(4), pages 1221-1237, November.
    10. Eggertsson, Gauti B. & Singh, Sanjay R., 2019. "Log-linear approximation versus an exact solution at the ZLB in the New Keynesian model," Journal of Economic Dynamics and Control, Elsevier, vol. 105(C), pages 21-43.
    11. Roulleau-Pasdeloup, Jordan, 2020. "Optimal monetary policy and determinacy under active/passive regimes," European Economic Review, Elsevier, vol. 130(C).
    12. McClung, Nigel, 2020. "E-stability vis-à-vis determinacy in regime-switching models," Journal of Economic Dynamics and Control, Elsevier, vol. 121(C).
    13. Gibbs, Christopher G. & McClung, Nigel, 2019. "Does my model predict a forward guidance puzzle?," Research Discussion Papers 19/2019, Bank of Finland.
    14. repec:zbw:bofrdp:2019_019 is not listed on IDEAS
    15. Lawrence J. Christiano & Martin S. Eichenbaum & Mathias Trabandt, 2018. "On DSGE Models," Journal of Economic Perspectives, American Economic Association, vol. 32(3), pages 113-140, Summer.
    16. Rodríguez Arosemena, Nicolás, 2018. "The Dominium Mundi Game and the Case for Artificial Intelligence in Economics and the Law," MPRA Paper 90560, University Library of Munich, Germany.
    17. George-Marios Angeletos & Chen Lian, 2021. "Determinacy without the Taylor Principle," NBER Working Papers 28881, National Bureau of Economic Research, Inc.
    18. Eo, Yunjong & McClung, Nigel, 2021. "Determinacy and E-stability with interest rate rules at the zero lower bound," Research Discussion Papers 14/2021, Bank of Finland.
    19. Eo, Yunjong & McClung, Nigel, 2021. "Determinacy and E-stability with interest rate rules at the zero lower bound," Bank of Finland Research Discussion Papers 14/2021, Bank of Finland.
    20. Lansing, Kevin J., 2021. "Endogenous forecast switching near the zero lower bound," Journal of Monetary Economics, Elsevier, vol. 117(C), pages 153-169.
    21. repec:zbw:bofrdp:019 is not listed on IDEAS
    22. Florin O. Bilbiie, 2022. "Neo-Fisherian Policies and Liquidity Traps," American Economic Journal: Macroeconomics, American Economic Association, vol. 14(4), pages 378-403, October.

    More about this item

    JEL classification:

    • E0 - Macroeconomics and Monetary Economics - - General
    • E3 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles

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