Vulnerable Banks
Vulnerable Banks Robin Greenwood Harvard University and NBER Augustin Landier Toulouse School of Economics David Thesmar HEC Paris and CEPR First draft: October 2011 Current draft: October 2012 Abstract When a bank experiences a negative shock to its equity, one way to return to target leverage is to sell assets. If asset sales occur at depressed prices, then one bank’s sales may impact other banks with common exposures, resulting in contagion. We propose a simple framework that accounts for how this effect adds up across the banking sector. Our framework explains how the distribution of bank leverage and risk exposures contributes to a form of systemic risk. We compute bank exposures to system-wide deleveraging, as well as the spillover of a single bank’s deleveraging onto other banks. We use the model to evaluate a variety of crisis interventions, such as mergers of good and bad banks, and equity injections. We apply the framework to European banks vulnerable to sovereign risk in 2010 and 2011. We are grateful to Tobias Adrian, Laurent Clerc, Linda Goldberg, Sam Hanson, Anil Kashyap, Yueran Ma, Jamie McAndrews, Thomas Philippon, Carmen Reinhart, Andrei Shleifer, Jeremy Stein, Adi Sunderam, and seminar participants at the Federal Reserve Bank of New York, Federal Reserve Board of Governors, TSE-Banque de France conference in Paris, Harvard, Sciences-Po, Zûrich and the NBER International and Risks of Financial Institutions conferences for their input. I. Introduction Financial stress experienced by banks can contaminate other banks and spiral into a shock that threatens the broader financial system: this is systemic risk.
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