The group of issues that falls under the heading of bank capital adequacy has received a great deal of attention from academics, regulators, and bankers in recent years and is likely to continue as a subject for debate for many years to come. Although the traditional questions debated in the literature on capital adequacy are important and remain unresolved, this paper is not directed at them. Instead, the approach here is to examine how bank regulators operating within the existing legal structure of regulation can pursue optimal policies with respect to the regulation of bank capital.