Capital Investment in Commercial Banking and Its Relationship to Portfolio Regulation

Abstract

A bank is the prototypical financial institution; there are notable outward differences between the wealth invested by owners of financial institutions and that of other industries. The capital of a financial institution consists largely of financial assets and only to a small degree of the physical plant and equipment usually associated with capital in other industries. Moreover, these physical differences are associated with important functional differences. A financial institution, like any other firm, faces the problem of combining the inputs which it purchases to produce the outputs which it sells. In banking, the most important inputs are labor and deposits, and they produce liquidity services, brokerage services, accounting and information services, and the like. In this production process, bank capital has two roles: (1) It cooperates directly with the other inputs in the production of bank services, and (2) it is used to attract the deposit input by providing insurance to depositors against a decline in the value of a bank's assets; the more capital a bank has, the more the value of its assets can fall before depositors incur losses. The difference between banking (and financial institutions in general) and most other industries is in the relative importance of these two roles. The equity capital of any firm serves, in part, to guarantee the value of the firm's fixed obligations, but that function is usually subordinate to the provision of assets to the firm. However, in banking, equity capital (and equity is the form that almost all nondeposit ownership interest in bank assets has taken) typically accounts for only about a tenth of total bank resources, and most of the returns to equity capital derive from its insurance function. Bank owners invest capital primarily to attract deposits, which are then used to buy assets, and only secondarily to buy assets directly. Apart from these novel economic aspects, a study of investment in banking provides the opportunity to study the effects of government