Target capital ratio and optimal channel(s) of adjustment: a simple model with empirical applications to European banks

Yann Braouezec and Keyvan Kiani

Applied Economics, 2021, vol. 53, issue 13, 1435-1462

Abstract: Why do banks decide to reach their target capital ratio by selling assets and/or issuing new shares? To answer this question, we offer a simple framework in which each channel of adjustment is costly; underwriting and dilution costs for equity issuance, profit reduction and price impact for asset sale. We make the assumption that the aim of the bank is to minimize the total adjustment cost subject to the target’s constraint and we derive its optimal strategy. The solution is formulated in terms of two critical thresholds for which we give an explicit formula. We then compare our model’s predictions to the decisions taken by two European systemic banks (Deutsche Bank and UniCredit) to issue new shares in 2017 and for which the target ratio was publicly disclosed. We show that the predictions of the model are consistent with the observed decisions.

Date: 2021
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DOI: 10.1080/00036846.2020.1820442

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