Quality Choice in Models of Vertical Differentiation
完整刻画了双寡头企业在垂直产品差异化模型中同时选择产品质量并随后进行价格竞争时的质量选择特征，精确阐述了“差异化原则”的内容，修正并完善了已有结论。
In this note, we offer the complete characterization of quality choices in a duopoly model of vertical product differentiation where firms simultaneously choose the quality of the product and then compete in prices. We thereby give precise content to the ''principle of differentiation'' in models of vertical product differentiation, which completes and amends previous results on the subject.