中文摘要：

基于“中国健康与养老追踪调查”（cHARLs）数据，运用双边随机边界模型，测度了信息不对称条件下我国中老年人群的医疗议价能力。主要结论有：医生和中老年患者的议价能力对医疗价格的形成具有重要影响，医生议价能力对医疗价格的影响程度高达72．28％，而中老年患者议价能力的影响仅占27．72％；医生与中老年患者的议价能力差别，使实际医疗服务价格比基准价格高出10．94个百分点；中老年患者的议价能力随着年龄的增加呈现出明显下降趋势，而且，在实际医疗价格的不同分位数上，医患双方的议价能力也有所不同。

英文摘要：

Based on the CHARLS data, this article makes an empirical analysis of the bargaining power of middle aged and elderly people by using two-tier stochastic frontier model under the con- dition of asymmetric information in China. The results show that bargaining power of both doctors and patients has a significant influence on the formation of medical price. On the medical price of middle aged and elderly people, the influence degree of the doctor is as high as 72.28%, but the influence of the patients is only accounted for 27.72%. The differences of bargaining power be- tween the doctors and the elderly patients makes the medical service prices above the base by10.94%.The bargaining power of elderly patients shows an obvious downward trend with aging, and as to the actual medical price, the bargaining power of doctors varies from patients at different quantiles.