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Sovereigns at risk: A dynamic model of sovereign debt and banking leverage

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  • Nuno Coimbra

    (PSE - Paris School of Economics - UP1 - Université Paris 1 Panthéon-Sorbonne - ENS-PSL - École normale supérieure - Paris - PSL - Université Paris Sciences et Lettres - EHESS - École des hautes études en sciences sociales - ENPC - École des Ponts ParisTech - CNRS - Centre National de la Recherche Scientifique - INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement, PJSE - Paris Jourdan Sciences Economiques - UP1 - Université Paris 1 Panthéon-Sorbonne - ENS-PSL - École normale supérieure - Paris - PSL - Université Paris Sciences et Lettres - EHESS - École des hautes études en sciences sociales - ENPC - École des Ponts ParisTech - CNRS - Centre National de la Recherche Scientifique - INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement)

Abstract
This paper develops a dynamic model with heterogeneous investors and sovereign default to analyze the dynamic link between banking sector capitalization and sovereign bond yields. The banking sector is modelled as operating under a Value-at-Risk (VaR) constraint, which can bind occasionally. As default risk rises, the constraint may bind, generating a fall in demand for sovereign bonds that can be accompanied by a rise in the risk premium if other agents are more risk averse. In turn, the rise in risk premium leads to a feedback effect through debt accumulation dynamics and the probability of government default.

Suggested Citation

  • Nuno Coimbra, 2020. "Sovereigns at risk: A dynamic model of sovereign debt and banking leverage," PSE-Ecole d'économie de Paris (Postprint) halshs-02491806, HAL.
    • Handle: RePEc:hal:pseptp:halshs-02491806
    DOI: 10.1016/j.jinteco.2020.103298
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    9. Nuno Coimbra & Hélène Rey, 2024. "Financial Cycles with Heterogeneous Intermediaries," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 91(2), pages 817-857.
    10. Anne-Laure Delatte & Julien Fouquau & Richard Portes, 2017. "Regime-Dependent Sovereign Risk Pricing During the Euro Crisis," Review of Finance, European Finance Association, vol. 21(1), pages 363-385.
    11. Willi Semmler & Christian R. Proaño, 2015. "Escape Routes from Sovereign Default Risk in the Euro Area," International Symposia in Economic Theory and Econometrics, in: Monetary Policy in the Context of the Financial Crisis: New Challenges and Lessons, volume 24, pages 163-193, Emerald Group Publishing Limited.
    12. Hélène Rey, 2016. "International Channels of Transmission of Monetary Policy and the Mundellian Trilemma," IMF Economic Review, Palgrave Macmillan;International Monetary Fund, vol. 64(1), pages 6-35, May.
    13. Nicholas Apergis & Ahdi Noomen Ajmi, 2015. "Systemic Sovereign Risk and Asset Prices: Evidence from the CDS Market, Stressed European Economies and Nonlinear Causality Tests," Czech Journal of Economics and Finance (Finance a uver), Charles University Prague, Faculty of Social Sciences, vol. 65(2), pages 106-126, April.
    14. Hürtgen, Patrick, 2020. "Fiscal sustainability duringthe COVID-19 pandemic," Discussion Papers 35/2020, Deutsche Bundesbank.
    15. Anne-Laure Delatte & Julien Fouquau & Richard Portes, 2017. "Regime-Dependent Sovereign Risk Pricing During the Euro Crisis," Review of Finance, European Finance Association, vol. 21(1), pages 363-385.
    16. Torres, Leonardo Barros & Paczos, Wojtek & Shakhnov,, 2024. "Domestic and Foreign Sovereign Debt Stability," Cardiff Economics Working Papers E2024/8, Cardiff University, Cardiff Business School, Economics Section.
    17. D’Erasmo, Pablo & Livshits, Igor & Schoors, Koen, 2024. "Banking regulation with risk of sovereign default," Journal of International Economics, Elsevier, vol. 150(C).
    18. Fueki, Takuji & Hürtgen, Patrick & Walker, Todd B., 2024. "Zero-risk weights and capital misallocation," Journal of Financial Stability, Elsevier, vol. 72(C).

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