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Contagion through common borrowers

Swarnava S. Biswas and Fabiana Gómez

Journal of Financial Stability, 2018, vol. 39, issue C, 125-132

Abstract: We propose a model in which banks are exposed to the risk of contagion through their portfolio of loans. We show that a solvency problem in one bank can be transmitted to another if they lend to the same borrower. The novelty is that the channel for the transmission involves banks’ monitoring incentives. The intensity with which all banks monitor a common borrower is reduced when one of the banks suffers a solvency shock. The reduced effort intensity affects the borrower's probability of success and creates a contagion (endogenous correlation) from the balance-sheet of the affected bank to the balance-sheet of the other banks lending to the same borrower. Banks hit by a solvency shock have lower incentives to monitor borrowers because less is left after paying depositors. Banks not hit by a solvency shock face borrowers’ risks entirely on their own, which increases the expected cost of lending. As a consequence, they respond by reducing the monitoring intensity for the common borrower. Bank equity can mitigate the risk of contagion.

Keywords: Financial contagion; Monitoring incentives; Systemic risk; Syndicated loans (search for similar items in EconPapers)
JEL-codes: G01 G21 (search for similar items in EconPapers)
Date: 2018
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