NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Optimal Bank Regulation In the Presence of Credit and Run-Risk

Anil K. Kashyap, Dimitrios P. Tsomocos, Alexandros P. Vardoulakis

NBER Working Paper No. 26689
Issued in January 2020
NBER Program(s):Corporate Finance, Monetary Economics

We modify the Diamond and Dybvig (1983) model so that, besides offering liquidity services to depositors, banks also raise equity funding, make loans that are risky, and can invest in safe, liquid assets. The bank and its borrowers are subject to limited liability. When profitable, banks monitor borrowers to ensure that they repay loans. Depositors may choose to run based on conjectures about the resources that are available for people withdrawing early and beliefs about banks’ monitoring. We use a new type of global game to solve for the run decision. We find that banks opt for a more deposit-intensive capital structure than a social planner would choose. The privately chosen asset portfolio can be more or less lending-intensive, while the scale of intermediation can also be higher or lower depending on a planner’s preferences between liquidity provision and credit extension. To correct these three distortions, a package of three regulations is warranted.

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Document Object Identifier (DOI): 10.3386/w26689

 
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