Capital adequacy historically has been an important concern of bank managements and regulators and a question on which there is little agreement as to guiding principles.l The role of bank can be examined from at least three different viewpoints: (1) that of depositors and the monetary system, (2) that of shareholders, and (3) that of the functioning of banks as financial intermediaries. Bank traditionally has been viewed primarily in terms of depositor interests, that is, (1) above, and most of the literature on capital adequacy reflects this viewpoint. The function of from the standpoint of depositor interests usually has been seen as bearing the risks of banking and thereby (a) protecting depositors of individual banks against loss and (b) guaranteeing the banking system as a whole against general banking panics. In attempting to judge how well bank has performed these functions, it is pertinent to note that, in normal times, bank earnings have been more than adequate to cover default and realized market losses and that in times of panic, positions appear to make little difference [1, 13, 27] . The relationship between positions and bank failure is a topic of controversy [1, 27]. Some writers [9, 14] have argued that deposit insurance has reduced, if not largely eliminated, the importance of with respect to both purposes (a) and (b) above. Additional questions have been raised by Peltzman [17] regarding the extent to which regulatory guidelines actually have influenced positions (see also Mayne [1 1 ] ). Although the evidence is mixed on a number of these issues, studies such as those cited above raise questions regarding the economic role of bank capital. Moore [12] has suggested that bank plays no economic role at all.2 Other wnters have defined the role of in such vague terms as to leave its importance in considerable doubt.3