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Optimal Time-Consistent Government Debt Maturity

Author

Listed:
  • Davide Debortoli
  • Ricardo Nunes
  • Pierre Yared
Abstract
This article develops a model of optimal government debt maturity in which the government cannot issue state-contingent bonds and cannot commit to fiscal policy. If the government can perfectly commit, it fully insulates the economy against government spending shocks by purchasing short-term assets and issuing long-term debt. These positions are quantitatively very large relative to GDP and do not need to be actively managed by the government. Our main result is that these conclusions are not robust to the introduction of lack of commitment. Under lack of commitment, large and tilted debt positions are very expensive to finance ex ante since they exacerbate the problem of lack of commitment ex post. In contrast, a flat maturity structure minimizes the cost of lack of commitment, though it also limits insurance and increases the volatility of fiscal policy distortions. We show that the optimal time-consistent maturity structure is nearly flat because reducing average borrowing costs is quantitatively more important for welfare than reducing fiscal policy volatility. Thus, under lack of commitment, the government actively manages its debt positions and can approximate optimal policy by confining its debt instruments to consols.

Suggested Citation

  • Davide Debortoli & Ricardo Nunes & Pierre Yared, 2017. "Optimal Time-Consistent Government Debt Maturity," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 132(1), pages 55-102.
    • Handle: RePEc:oup:qjecon:v:132:y:2017:i:1:p:55-102.
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    File URL: http://hdl.handle.net/10.1093/qje/qjw038
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    More about this item

    JEL classification:

    • E62 - Macroeconomics and Monetary Economics - - Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General Outlook - - - Fiscal Policy; Modern Monetary Theory
    • H21 - Public Economics - - Taxation, Subsidies, and Revenue - - - Efficiency; Optimal Taxation
    • H63 - Public Economics - - National Budget, Deficit, and Debt - - - Debt; Debt Management; Sovereign Debt

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