本文构建上游企业为一个垄断厂商和下游为存在质量差异且进行伯川德竞争双寡头厂商组成的纵向结构,考察不同纵向结构对企业利润与消费者福利的影响。研究表明:上游投入品生产企业对下游企业实行差别定价;与纵向分离结构相比,纵向一体化结构下中间产品价格降低,使得最终产品价格下降,产品需求增加,企业利润提高;消费者福利取决于产品间的质量差异:当最终产品质量差异较大时,纵向一体化结构改善了消费者福利,当产品质量差异较小时,纵向一体化结构使消费者福利降低。 This paper constructs a vertical structure consisting of a monopolist firm and a downstream duopoly company with dubious oligopoly, and examines the influence of different vertical structures on corporate profits and consumer welfare. The research shows that: Upstream input product companies implement differential pricing for downstream companies; Compared with vertically-separated structures, prices of intermediate products under vertical integration structure decrease, resulting in lower prices of final products, increased product demand, and higher corporate profits; consumer welfare depends on Quality difference between products: When the quality of the final product varies greatly, the vertical integration structure improves consumer welfare. When the product quality is less different, the vertical integration structure reduces consumer welfare.