An Empirical Study on the Influence of Diversification on the Operating Cost of Commercial Banks

The majority of the literature has focused on the impact of diversification on bank performance, while the research on the impact of diversification on bank costs is inadequate. Therefore, in this paper we empirically analyzed the impact of diversification on operating costs through a panel regression model, collecting the data of 47 Chinese commercial banks from 2005 to 2015. The empirical results showed that an increase in the non-interest income ratio significantly promoted a decrease in the cost–income ratio, and the robustness tests of different time intervals and different types of banks were consistent. This suggests that diversification effectively reduced the operating costs of banks by means of the sharing of information and equipment, the reduction of asset specificity, and the improvement of operation management synergy. This also indicates that excessive competition costs and the agency costs of diversification were lower. Further analysis showed that the diversification of national banks compared with local banks was more significant in reducing operating costs, and, for the national banks, the effects of economies of scope and scale were stronger. Diversified management strategies for local banks should be carefully promoted through the construction of strategic alliances, mergers and acquisitions, etc.