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Intermediation and Voluntary Exposure to Counterparty Risk

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Systemic Risk: Mathematical Modelling and Interdisciplinary Approaches

I develop a model of the financial sector in which endogenous intermediation among debt financed banks generates excessive systemic risk. Financial institutions have incentives to capture intermediation spreads through strategic borrowing and lending decisions. By doing so, they tilt the division of surplus along an intermediation chain in their favor, while at the same time reducing aggregate surplus. I show that a core-periphery network—few highly interconnected and many sparsely connected banks—endogenously emerges in my model. The network is inefficient relative to a constrained efficient benchmark since banks who make risky investments “overconnect”, exposing themselves to excessive counterparty risk, while banks who mainly provide funding end up with too few connections. The predictions of the model are consistent with empirical evidence in the literature.

This talk is part of the Isaac Newton Institute Seminar Series series.

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