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Externalities as Arbitrage

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  • Benjamin M. Hébert

Abstract

How can we assess whether macro-prudential regulations are having their intended effects? If these regulations are optimal, their marginal benefit of addressing externalities should equal their marginal cost of distorting risk-sharing. These risk-sharing distortions will manifest as trading opportunities that intermediaries are unable to exploit. Focusing in particular on arbitrage opportunities, I construct an “externality-mimicking portfolio” whose returns track the externalities that would rationalize existing regulations as optimal. I conduct a revealed-preference exercise using this portfolio and test whether the recovered externalities are sensible. I find that the signs of existing CIP violations are inconsistent with optimal policy.

Suggested Citation

  • Benjamin M. Hébert, 2020. "Externalities as Arbitrage," NBER Working Papers 27953, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:27953
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    Cited by:

    1. van Binsbergen, Jules H. & Diamond, William F. & Grotteria, Marco, 2022. "Risk-free interest rates," Journal of Financial Economics, Elsevier, vol. 143(1), pages 1-29.
    2. Malamud, Semyon & Schrimpf, Paul, 2018. "An Intermediation-Based Model of Exchange Rates," CEPR Discussion Papers 13182, C.E.P.R. Discussion Papers.
    3. Semyon Malamud & Andreas Schrimpf, 2016. "Intermediation Markups and Monetary Policy Passthrough," Swiss Finance Institute Research Paper Series 16-75, Swiss Finance Institute.

    More about this item

    JEL classification:

    • E61 - Macroeconomics and Monetary Economics - - Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General Outlook - - - Policy Objectives; Policy Designs and Consistency; Policy Coordination
    • F31 - International Economics - - International Finance - - - Foreign Exchange
    • G28 - Financial Economics - - Financial Institutions and Services - - - Government Policy and Regulation

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