Bank Regulation under Fire Sale Externalities

Gazi I Kara, S Mehmet Ozsoy and Itay Goldstein

The Review of Financial Studies, 2020, vol. 33, issue 6, 2554-2584

Abstract: We examine the optimal design of and interaction between capital and liquidity regulations. Banks, not internalizing fire sale externalities, overinvest in risky assets and underinvest in liquid assets in the competitive equilibrium. Capital requirements can alleviate the inefficiency, but banks respond by decreasing their liquidity ratios. When capital requirements are the only available tool, the regulator tightens them to offset banks’ lower liquidity ratios, leading to fewer risky assets and less liquidity compared with the second best. Macroprudential liquidity requirements that complement capital regulations implement the second best, improve financial stability, and allow for more investment in risky assets.Authors have furnished an Internet Appendix, which is available on the Oxford University Press Web site next to the link to the final published paper online.

Date: 2020
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