考虑到含有部分私有化的公共企业、纯私营企业、合资企业的混合三寡头市场竞争,构建了混合三寡头的两阶段博弈模型,得出了企业在研发投资时各个变量的均衡解以及最优解,并分析了私有化程度、合资企业的国内控股比例对研发投入、社会福利的影响。结果表明私有化程度的提高将会使公共企业减少研发投入,私营企业和合资企业将会增加投入；合资企业的国内控股比例的增加将会提高最优社会福利。

Considering the mixed triopoly market competition containing one public firm with partial privatization, one pure private firm and one joint venture with domestic and foreign stockholders, this paper constructs a two-stage game model based on mixed triopoly, and obtains the equilibrium solution and optimal solution of each variable when firms invest in R D. The impact of the degree of privatization and domestic stockholding of joint venture on the R D investment and social welfare are analyzed. The result shows that the R D investment of public firm will decrease and the R D investment of private firm and joint venture will increase along with an increasing the degree of privatization, an increase in domestic stockholding of joint venture will improve optimal social welfare.

国家科技部支撑计划项目“产业集群金融和技术转移服务平台总体技术研究”(2012BAH29F01)；安徽财经大学科研项目“产品差异化情形下企业的研发投入策略研究”（ACKY1420）。