Competitive viability in banking: scale, scope, and product mix economies

Abstract Conventional scale and scope economies are inadequate to determine the competitive viability of banks that vary in scale and product mix simultaneously. This paper develops two new and more general measures of multi-product economies. Slight diseconomies of scale and product mix are found for banks, usually on the order of 1 to 3 percent, which may be due to demand-side influences. These are robust to differing cost and output specifications, organizational levels, and competitive environments. These results differ from other banking studies that found scope economies, a conflict that may be due to methodological difficulties.