中文摘要：

本文运用1999—2012年我国17家商业银行的数据探讨中国商业银行市场势力与利润效率之间的关系。运用勒纳指数与利润效率测度我国5家国有商业银行和12家股份制银行的市场势力与效率后，发现我国商业银行市场竞争程度在样本期内并未加强但利润效率有极大的提升；与国有商业银行相比，股份制银行具有较低的市场势力和较高的利润效率。同时运用两步系统GMM法对中国银行业市场势力与效率的关系进行估计，结果发现格兰杰因果关系在市场势力与效率间并不存在。

英文摘要：

This paper addresses the relationship between bank competition and efficiency by computing Lemer indices and profit efficiency scores for a sample of Chinese banks over the period 1999-2012. After estimating the market power and efficiency of 5 large state-owned commercial banks and 12 joint-stock commercial banks in China by mean of Lerner index and profit efficiency, the results show that no increase in bank competition over the period, even as profit efficiency improves. We observe that the joint-stock commercial banks have lower market power and higher profit efficiency compared with the state-owned commercial banks. Granger-causality tests are performed in a dynamic GMM panel estimator framework to evaluate the sign and direction of causality between the market power and efficiency. Different from the empirical literature showing that competition negatively Granger-causes efficiency for Western banks, we find no significant relation between competition and efficiency.