This article proposes a Cournot model of two-stage competition to examine the patterns of vertical product differentiation in a multiproduct duopoly. Firms simultaneously choose the number of products and their qualities at the first stage and compete in quantities at the second stage. We show...

Most theoretical work on the behavior of spatial monopoly focuses on the single-product case, while, in reality, a firm usually produces (or sells) many differentiated products. In this paper, I introduce a new model of spatial monopoly with a multiple-product firm where the firm chooses both...