The Study of Bank Interest Margins Based on the Empirical Data of China
从多维度定义银行利差，利用1998-2006年中国商业银行数据，发现利差处于中上水平且呈上升趋势，风险变量影响不显著，国有银行机会成本与利差正相关，宏观经济因素有一定影响，但收费业务与利差无因果关系。
The moderate bank interest margins is helpful for commercial banks to enhance their businesses innovation and efficiency.From the multi-dimension angle,the paper suggests a broader definition of interest margins, including a traditional measure of interest margins(loan to deposits rate spread),a wide accounting margin (related to off-balance activities) and a broader measure of marginal spread based on the Lemer index(reflecting market power).By using the interest margins data in the period of 1998-2006,the author empirically analyzes the interest margins of commercial banks in China.The results indicate that interest margins of Chinese commercial banks are in middle-upper level and present an increasing trend and the risk variable is not significantly affecting bank margins.The opportunity cost of the stated-own banks is also positively and significantly related to interest margins.The macroeconomic factors are somehow affecting on interest margins.But this is not causal relationship between the fee-based business and bank interest margins.