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The Preferential Treatment of Green Bonds

Author

Listed:
  • Francesco Giovanardi

    (University of Cologne)

  • Matthias Kaldorf

    (Deutsche Bundesbank)

  • Lucas Radke

    (University of Cologne)

  • Florian Wicknig

    (Deutsche Bundesbank)

Abstract

We study the preferential treatment of green bonds in the central bank collateral framework as a climate policy instrument within a DSGE model with climate and financial frictions. In the model, green and carbon-emitting conventional firms issue defaultable corporate bonds to banks that use them as collateral, subject to haircuts determined by the central bank. A haircut reduction induces firms to increase bond issuance, investment, leverage, and default risk. Collateral policy solves a trade-off between increasing collateral supply, adverse effects on firm risk-taking, and subsidizing green investment. Optimal collateral policy is characterized by a haircut gap of 20 percentage points, which increases the green investment share and reduces emissions. However, welfare gains fall well short of what can be achieved with optimal carbon taxes. Moreover, due to elevated risk-taking of green firms, preferential treatment is a qualitatively imperfect substitute of Pigouvian taxation on emissions: if and only if the optimal emission tax can not be implemented, optimal collateral policy features a preferential treatment of green bonds. (Copyright: Elsevier)

Suggested Citation

  • Francesco Giovanardi & Matthias Kaldorf & Lucas Radke & Florian Wicknig, 2023. "The Preferential Treatment of Green Bonds," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 51, pages 657-676, December.
    • Handle: RePEc:red:issued:21-297
    DOI: 10.1016/j.red.2023.06.006
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    Cited by:

    1. Alessandro Ferrari & Valerio Nispi Landi, 2022. "Toward a green economy: the role of central bank's asset purchases," Temi di discussione (Economic working papers) 1358, Bank of Italy, Economic Research and International Relations Area.
    2. Patrick Gruning, 2022. "Fiscal, Environmental, and Bank Regulation Policies in a Small Open Economy for the Green Transition," Working Papers 2022/06, Latvijas Banka.
    3. Diluiso, Francesca & Annicchiarico, Barbara & Kalkuhl, Matthias & Minx, Jan C., 2021. "Climate actions and macro-financial stability: The role of central banks," Journal of Environmental Economics and Management, Elsevier, vol. 110(C).
    4. Abiry, Raphael & Ferdinandusse, Marien & Ludwig, Alexander & Nerlich, Carolin, 2022. "Climate change mitigation: How effective is green quantitative easing?," SAFE Working Paper Series 376, Leibniz Institute for Financial Research SAFE.
    5. Döttling, Robin & Lam, Adrian, 2023. "Does Monetary Policy Shape the Path to Carbon Neutrality?," OSF Preprints kqdar, Center for Open Science.

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    More about this item

    Keywords

    Green Investment; Collateral Framework; Climate Policy;
    All these keywords.

    JEL classification:

    • E44 - Macroeconomics and Monetary Economics - - Money and Interest Rates - - - Financial Markets and the Macroeconomy
    • E58 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Central Banks and Their Policies
    • E63 - Macroeconomics and Monetary Economics - - Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General Outlook - - - Comparative or Joint Analysis of Fiscal and Monetary Policy; Stabilization; Treasury Policy
    • Q58 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Environmental Economics - - - Environmental Economics: Government Policy

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