Larry D. Wall
Working Paper 2013-15
December 2013

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The United States is now committed to using two relatively sophisticated approaches to measuring capital adequacy: Basel III and stress tests. This paper shows how stress testing could mitigate weaknesses in the way Basel III measures credit and interest rate risk, the way it measures bank capital, and the way it creates countercyclical capital buffers. However, this paper also emphasizes the extent to which stress tests add value will depend upon the exercise of supervisor discretion in the design of stress scenarios. Whether supervisors will use this discretion more effectively than they have used other tools in the past remains to be seen.

JEL classification: G01, G21, G28, E50

Key words: capital adequacy, Basel capital ratios, stress test

The author thanks Scott Frame, Gillian Garcia and Bev Hirtle for helpful comments on a prior version of this paper titled "Supervisory Stress Testing: Will the Long-Run Benefits Exceed the On-going Stress." The views expressed here are the authors' and not necessarily those of the Federal Reserve Bank of Atlanta or the Federal Reserve System. Any remaining errors are the authors' responsibility.

Please address questions regarding content to Larry D. Wall, Research Department, Federal Reserve Bank of Atlanta, 1000 Peachtree Street, N.E., Atlanta, GA 30309-4470, 404-498-8937,

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