英文文献：Horizontal Differentiation With Differential Input Costs: Retail Prices For Milk By Fat Content-不同投入成本的水平差异:按脂肪含量划分的牛奶零售价格
英文文献作者：Sexton, Richard J.,Xia, Tian,Carman, Hoy F.
英文文献摘要：
Markets for horizontally differentiated products with differential costs are important and have unique features. This paper studies sellers' pricing strategy and market equilibrium in these markets under various competition scenarios in the context of retail milk markets. An empirical study is also conducted to examine the effects of cost factors on retail milk prices and to characterize competition in markets in four California cities.

具有不同成本的水平差异化产品的市场是重要的，并且具有独特的特点。本文以牛奶零售市场为背景，研究了在不同竞争情境下，这些市场的卖方定价策略和市场均衡。实证研究也进行了检验成本因素对零售牛奶价格的影响，并表征市场竞争在四个加州城市。