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De l'utilité de l'impôt pour freiner l'effet de levier du « hors-bilan » des banques

Author

Listed:
  • Jean-Paul Nicolaï

    (Secrétariat général pour l'investissement)

  • Alain Trannoy

    (EHESS - École des hautes études en sciences sociales, AMSE - Aix-Marseille Sciences Economiques - EHESS - École des hautes études en sciences sociales - AMU - Aix Marseille Université - ECM - École Centrale de Marseille - CNRS - Centre National de la Recherche Scientifique)

Abstract

[Fr] Les normes comptables IFRS ont intégré dans le bilan des banques l'essentiel des instruments financiers dérivés que nous considérons ici sous le terme de « hors-bilan », au prix d'une certaine invisibilité de leur « effet de levier ». Nous décrivons l'activité des banques de financement et d'investissement et montrons que ces instruments dérivés correspondent à une fonction d'intermédiation du risque dans l'économie où les banques ne « portent » pas ce risque au bilan, contrairement au métier bancaire traditionnel de « transformation ». Nous décrivons la banque comme une source d'« accroissement des possibles de la taille du marché » que nous définissons au préalable d'une manière générale. Une telle source, comme toute innovation, est synonyme de risque. Le « hors-bilan » bancaire apparaît dans ce cadre comme un effet de levier sans limite naturelle. Nous étudions alors ce que pourraient être des fiscalités adaptées à trois objectifs différents : corriger et capter les rentes, limiter le risque systémique, maîtriser l'« accroissement des possibles ». Une assiette considérant une mesure des engagements en valeur absolue associés aux positions sur les produits dérivés, dans le bilan des banques, paraît pertinente pour limiter l'accroissement des possibles et, partant de là, le risque. [Eng] The accounting standard IRFS have integrated the bulk of derivatives (the off-balance sheet in this paper) in the balance sheet of the banks at the cost of masking their leverage effect. We describe the bank activity and we show that these derivatives correspond to a financial intermediation function of the banking system, which supplements the standard lending role of banks. We show that the banking activity naturally increases the possibility set of the capital market that we define in general terms. As all innovations, this increase bears additional risk. The off-balance sheet appears in this framework as bringing a leverage effect without natural limit. We study what could be the role of different types of taxes: first, correcting and capturing the rents, second, limiting the systemic risk, third, mastering the "growth of the feasible set". A tax base consisting in financial liabilities (in absolute value) associated to positions on financial derivatives may be viewed as well-focused to limit the growth of the possibility set and therefore of the risk.

Suggested Citation

  • Jean-Paul Nicolaï & Alain Trannoy, 2018. "De l'utilité de l'impôt pour freiner l'effet de levier du « hors-bilan » des banques," Post-Print hal-01994827, HAL.
  • Handle: RePEc:hal:journl:hal-01994827
    DOI: 10.3917/ecofi.131.0151
    Note: View the original document on HAL open archive server: https://amu.hal.science/hal-01994827
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    1. Luigi Pascali, 2016. "Banks and Development: Jewish Communities in the Italian Renaissance and Current Economic Performance," The Review of Economics and Statistics, MIT Press, vol. 98(1), pages 140-158, March.
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    More about this item

    JEL classification:

    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
    • G32 - Financial Economics - - Corporate Finance and Governance - - - Financing Policy; Financial Risk and Risk Management; Capital and Ownership Structure; Value of Firms; Goodwill
    • G38 - Financial Economics - - Corporate Finance and Governance - - - Government Policy and Regulation

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