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Collateral Unchained: Rehypothecation Networks, Concentration and Systemic Effects

Author

Listed:
  • Duc Thi Luu

    (University of Kiel, Germany)

  • Mauro Napoletano

    (OFCE Sciences-Po
    SKEMA Business School)

  • Paolo Barucca

    (University of Zurich, Switzerland
    Scuola Superiore Sant'Anna, Pisa (Italy))

  • Stefano Battiston

    (University of Zurich, Switzerland)

Abstract

We study how network structure affects the dynamics of collateral in presence of rehypothecation. We build a simple model wherein banks interact via chains of repo contracts and use their proprietary collateral or re-use the collateral obtained by other banks via reverse repos. In this framework, we show that total collateral volume and its velocity are affected by characteristics of the network like the length of rehypothecation chains, the presence or not of chains having a cyclic structure, the direction of collateral flows, the density of the network. In addition, we show that structures where collateral flows are concentrated among few nodes (like in core-periphery networks) allow large increases in collateral volumes already with small network density. Furthermore, we introduce in the model collateral hoarding rates determined according to a Value-at-Risk (VaR) criterion, and we then study the emergence of collateral hoarding cascades in different networks. Our results highlight that network structures with highly concentrated collateral flows are also more exposed to large collateral hoarding cascades following local shocks. These networks are therefore characterized by a trade-off between liquidity and systemic risk.

Suggested Citation

  • Duc Thi Luu & Mauro Napoletano & Paolo Barucca & Stefano Battiston, 2018. "Collateral Unchained: Rehypothecation Networks, Concentration and Systemic Effects," GREDEG Working Papers 2018-05, Groupe de REcherche en Droit, Economie, Gestion (GREDEG CNRS), Université Côte d'Azur, France.
  • Handle: RePEc:gre:wpaper:2018-05
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    References listed on IDEAS

    as
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    Cited by:

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    2. David Aikman & Daniel Beale & Adam Brinley-Codd & Anne-Caroline Hüser & Giovanni Covi & Caterina Lepore, 2023. "Macro-Prudential Stress Test Models: A Survey," IMF Working Papers 2023/173, International Monetary Fund.
    3. Jean-Luc Gaffard & Mauro Napoletano, 2018. "Hétérogénéité des agents, interconnexions financières et politique monétaire : une approche non conventionnelle," Revue française d'économie, Presses de Sciences-Po, vol. 0(3), pages 201-231.
    4. Mauro Napoletano & Eric Guerci & Nobuyuki Hanaki, 2018. "Recent advances in financial networks and agent-based model validation," Journal of Economic Interaction and Coordination, Springer;Society for Economic Science with Heterogeneous Interacting Agents, vol. 13(1), pages 1-7, April.
    5. Jean-Luc Gaffard & Mauro Napoletano, 2018. "Market disequilibrium, monetary policy, and financial markets: insights from new tools," LEM Papers Series 2018/17, Laboratory of Economics and Management (LEM), Sant'Anna School of Advanced Studies, Pisa, Italy.
    6. Javier Sánchez García & Salvador Cruz Rambaud, 2024. "The network econometrics of financial concentration," Review of Managerial Science, Springer, vol. 18(7), pages 2007-2045, July.
    7. repec:spo:wpmain:info:hdl:2441/3tl6t49e929fla0aa2ukppot8n is not listed on IDEAS
    8. repec:hal:spmain:info:hdl:2441/3tl6t49e929fla0aa2ukppot8n is not listed on IDEAS
    9. Hüser, Anne-Caroline & Lepore, Caterina & Veraart, Luitgard, 2021. "How does the repo market behave under stress? Evidence from the Covid-19 crisis," Bank of England working papers 910, Bank of England, revised 18 Jun 2021.
    10. Justus Inhoffen & Iman van Lelyveld, 2023. "Safe Asset Scarcity and Re-use in the European Repo Market," Discussion Papers of DIW Berlin 2050, DIW Berlin, German Institute for Economic Research.
    11. Roncoroni, Alan & Battiston, Stefano & Escobar-Farfán, Luis O.L. & Martinez-Jaramillo, Serafin, 2021. "Climate risk and financial stability in the network of banks and investment funds," Journal of Financial Stability, Elsevier, vol. 54(C).
    12. Minh-Quan Nguyen & Nhat-Tan Le & Khuong Nguyen-An & Duc-Thi Luu, 2024. "An Integral Equation Approach for the Valuation of Finite-maturity margin-call Stock Loans," Papers 2407.14728, arXiv.org.
    13. Yan, Guan & Liu, Zhidong, 2023. "Interconnectedness of financial institutions based on pledged shares in China," Finance Research Letters, Elsevier, vol. 57(C).

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    More about this item

    Keywords

    Rehypothecation; Collateral; Repo Contracts; Networks; Liquidity; Collateral-Hoarding Effects; Systemic Risk;
    All these keywords.

    JEL classification:

    • G01 - Financial Economics - - General - - - Financial Crises
    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G32 - Financial Economics - - Corporate Finance and Governance - - - Financing Policy; Financial Risk and Risk Management; Capital and Ownership Structure; Value of Firms; Goodwill
    • G33 - Financial Economics - - Corporate Finance and Governance - - - Bankruptcy; Liquidation

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