Controlling for the use of extreme weights in bank efficiency assessments during the financial crisis

Asmild, Mette and Zhu, Minyan (2016) Controlling for the use of extreme weights in bank efficiency assessments during the financial crisis. European Journal of Operational Research, 251 (3). pp. 999-1015. ISSN 0377-2217

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We propose a method for bank efficiency assessment, based on weight restricted DEA, that limits banks’ abilities to use extreme weights, corresponding to extreme judgements of the risk adjusted prices on funding sources and assets. Based on a data set comprising the largest European banks during the financial crisis, we illustrate the impact of the proposed weight restrictions in two different efficiency models; one related to banks’ funding mix and one related to their asset mix. The results show that using a more balanced set of weights tend to reduce the estimated efficiency scores more for those banks which were bailed out during the crisis, which confirms the potential bias within standard DEA that does not control for extreme weights applied by highly risky banks. We discuss the use of the proposed method as a regulatory tool to constrain discretion when complying with regulatory capital benchmarks such as the Basel regulatory capital ratios.

Item Type: Article
Keywords: Data Envelopment Analysis (DEA), Weight restrictions, Banking, Effi¬ciency, risk, Financial crisis, Regulation, benchmarks
Schools/Departments: University of Nottingham, UK > Faculty of Social Sciences > Nottingham University Business School
Identification Number: 10.1016/j.ejor.2015.12.021
Depositing User: Fuller, Stella
Date Deposited: 13 Oct 2016 08:56
Last Modified: 29 Dec 2017 03:19

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