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A Theory of Systemic Risk and Design of Prudential Bank Regulation

  • Acharya, Viral V

Systemic risk is modeled as the endogenously chosen correlation of returns on assets held by banks. The limited liability of banks and the presence of a negative externality of one bank’s failure on the health of other banks give rise to a systemic risk-shifting incentive where all banks undertake correlated investments, thereby increasing economy-wide aggregate risk. Regulatory mechanisms such as bank closure policy and capital adequacy requirements that are commonly based only on a bank’s own risk fail to mitigate aggregate risk-shifting incentives, and can, in fact, accentuate systemic risk. Prudential regulation is shown to operate at a collective level, regulating each bank as a function of both its joint (correlated) risk with other banks as well as its individual (bank-specific) risk.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 7164.

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Date of creation: Feb 2009
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Handle: RePEc:cpr:ceprdp:7164
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