In this article I investigate three single-shot models of differentiated-products oligopoly. In each model firms choose both output and price. The demand, cost, and spillover demand specifications are quite general, and there are three main results. First, with simultaneous choice there is no...

We investigate a spatial duopoly in which the firms simultaneously select locations at the beginning of time; once chosen, the locations are fixed forever, but the firms will choose prices in each of a countably infinite succession of time periods. We are interested in equilibrium behavior when...