Collateral Unchained: Rehypothecation networks, concentration and systemic effects

Duc Thi Luu, Mauro Napoletano, Paolo Barucca and Stefano Battiston
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Duc Thi Luu: University of Kiel Germany and OFCE Sciences Po, Paris, France
Paolo Barucca: Institute for Mathematical Sciences, London, UK & University of Zurich, Switzerland

No 2018-07, Documents de Travail de l'OFCE from Observatoire Francais des Conjonctures Economiques (OFCE)

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.

Keywords: Rehypothecation; Collateral; Repo Contracts; Networks; Liquidity; Collateral Hoarding effects; Systemic risk (search for similar items in EconPapers)
JEL-codes: G01 G11 G32 G33 (search for similar items in EconPapers)
Date: 2018-01
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Citations: View citations in EconPapers (6)

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Related works:
Journal Article: Collateral Unchained: Rehypothecation networks, concentration and systemic effects (2021)
Working Paper: Collateral Unchained: Rehypothecation networks, concentration and systemic effects (2021)
Working Paper: Collateral Unchained: Rehypothecation networks, concentration and systemic effects (2021)
Working Paper: Collateral Unchained: Rehypothecation networks, concentration and systemic effects (2018)
Working Paper: Collateral Unchained: Rehypothecation Networks, Concentration and Systemic Effects (2018)
Working Paper: Collateral Unchained: Rehypothecation networkd, concentration and systemic effects (2018)
Working Paper: Collateral Unchained: Rehypothecation networkd, concentration and systemic effects (2018)
Working Paper: Collateral Unchained: Rehypothecation networks, concentration and systemic effects (2018)
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