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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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    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. repec:zbw:bofrdp:2019_019 is not listed on IDEAS
    3. 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.
    4. 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.
    5. 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.
    6. 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.
    7. George-Marios Angeletos & Chen Lian, 2021. "Determinacy without the Taylor Principle," NBER Working Papers 28881, National Bureau of Economic Research, Inc.
    8. 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.
    9. 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.
    10. 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.
    11. 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.
    12. Lansing, Kevin J., 2021. "Endogenous forecast switching near the zero lower bound," Journal of Monetary Economics, Elsevier, vol. 117(C), pages 153-169.
    13. 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.
    14. 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.
    15. repec:zbw:bofrdp:2021_014 is not listed on IDEAS
    16. repec:zbw:bofrdp:019 is not listed on IDEAS
    17. 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.
    18. Gibbs, Christopher G. & McClung, Nigel, 2019. "Does my model predict a forward guidance puzzle?," Research Discussion Papers 19, Bank of Finland.
    19. 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.
    20. Roulleau-Pasdeloup, Jordan, 2020. "Optimal monetary policy and determinacy under active/passive regimes," European Economic Review, Elsevier, vol. 130(C).
    21. Florin O. Bilbiie, 2022. "Neo-Fisherian Policies and Liquidity Traps," American Economic Journal: Macroeconomics, American Economic Association, vol. 14(4), pages 378-403, October.
    22. McClung, Nigel, 2020. "E-stability vis-à-vis determinacy in regime-switching models," Journal of Economic Dynamics and Control, Elsevier, vol. 121(C).

    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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