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Optimal macroprudential policy and rational bubbles

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  • Freixas, Xavier
  • Perez-Reyna, David

Abstract

We provide a microfounded framework for the welfare analysis of macroprudential policy within a model of rational bubbles. For this, we posit an overlapping generation model where productivity and credit supply are subject to random shocks. We find that when real interest rates are lower than the rate of growth, credit financed bubbles may be welfare improving because of their role as a buffer in channeling excessive credit supply and inefficient investment at the firms’ level, but their sudden price decrease may cause a systemic crisis. Therefore, a well designed macroprudential policy plays a key role in improving efficiency while preserving financial stability. Our theoretical framework allows us to compare the efficiency of alternative macroprudential policies. Contrarily to conventional wisdom, we show that macroprudential policy (i) may be efficient even in the absence of systemic risk, (ii) has to be contingent on productivity shocks and (iii) must be contingent upon the level of real interest rates.

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  • Freixas, Xavier & Perez-Reyna, David, 2021. "Optimal macroprudential policy and rational bubbles," Journal of Financial Intermediation, Elsevier, vol. 46(C).
    • Handle: RePEc:eee:jfinin:v:46:y:2021:i:c:s1042957321000097
    DOI: 10.1016/j.jfi.2021.100908
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    More about this item

    Keywords

    Bank; bubble; macroprudential regulation; E44; E60; G18; G21; G28;
    All these keywords.

    JEL classification:

    • E44 - Macroeconomics and Monetary Economics - - Money and Interest Rates - - - Financial Markets and the Macroeconomy
    • E60 - Macroeconomics and Monetary Economics - - Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General Outlook - - - General
    • G18 - Financial Economics - - General Financial Markets - - - Government Policy and Regulation
    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
    • G28 - Financial Economics - - Financial Institutions and Services - - - Government Policy and Regulation

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