銀行的市場佔有率與獲利，及其影響因素之探討－全球實證分析

This paper investigates the effects of bank market share on bank profit, which is referred to as the market share effects, using 3168 banks from 44 countries. Previous empirical studies which used single countries to probe the same issue have not reached consensus results. We resolve this puzzle by considering five conditional variables, which are Structure (bank concentration ratio), Efficiency (cost/income), Regulation (restriction on bank activities and entry barriers), Governance (investor protection, creditor protection and law efficiency) and Income (GDP per capita). This study proposes that in countries with concentrated market structure, strong operating efficiency and good governance structure, positive market share effect tends to be enhanced while negative market share effect tends to be mitigated. The opposite is true for countries with less market concentration, poor operating efficiency and weak governance structure. Our evidence also indicates positive market share effect for entry barriers, but not for banking restrictions. Finally, GDP per capita is not associated with market share effect in any significant way.