The impact of capital requirements on bank capital
This paper presents the first causal evidence on how banks adjust their voluntary capital buffers (the capital headroom above the required level) in response to changes in capital requirements. Using granular euro area data and exploiting the threshold-based assignment of Other Systemically Important Institution (O-SII) buffers within a regression discontinuity design, we study the liability side of banks’ balance sheets, complementing the asset-focused literature on lending and risk-taking.