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Optimal Time-Consistent Macroprudential Policy

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  • Javier Bianchi
  • Enrique G. Mendoza

Abstract

Collateral constraints widely used in models of financial crises feature a pecuniary externality: Agents do not internalize how borrowing decisions made in “good times” affect collateral prices during a crisis. We show that under commitment the optimal financial regulator’s plans are time inconsistent and study time-consistent policy. Quantitatively, this policy reduces sharply the frequency and magnitude of crises, removes fat tails from the distribution of asset returns, and increases social welfare. In contrast, constant debt taxes are ineffective and can be welfare reducing, while an optimized “macroprudential Taylor rule” is effective but less so than the optimal time-consistent policy.

Suggested Citation

  • Javier Bianchi & Enrique G. Mendoza, 2018. "Optimal Time-Consistent Macroprudential Policy," Journal of Political Economy, University of Chicago Press, vol. 126(2), pages 588-634.
  • Handle: RePEc:ucp:jpolec:doi:10.1086/696280
    DOI: 10.1086/696280
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    More about this item

    JEL classification:

    • D62 - Microeconomics - - Welfare Economics - - - Externalities
    • E32 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Business Fluctuations; Cycles
    • E44 - Macroeconomics and Monetary Economics - - Money and Interest Rates - - - Financial Markets and the Macroeconomy
    • F32 - International Economics - - International Finance - - - Current Account Adjustment; Short-term Capital Movements
    • F41 - International Economics - - Macroeconomic Aspects of International Trade and Finance - - - Open Economy Macroeconomics

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