The theory of discriminating monopoly, although well developed along partial equilibrium lines, has been neglected in the pure theory of international trade. In this paper we examine the effects of a domestic monopolist engaging in price discrimination between national markets in the context of a general equilibrium framework. First, we compare a competitive trade equilibrium with a trade equilibrium characterised by the presence of a simple domestic monopolist. We then compare this latter equilibrium with the various possible equilibria that can arise when the monopolist is given the opportunity to engage in international price discrimination. In contrast to other studies which have explored in general equilibrium systems the impact of monopoly on trade flows, we examine income distributional effects that result from the presence of monopoly.' Welfare effects are also considered. Our model is a standard 2 x 2 x 2 trade model with, however, two additional restrictions. That is, we assume two economies, each of which is capable of producing two commodities directly with two factors under constant returns. Although total factor supplies are insensitive to changes in remuneration, factors do move frictionlessly between industries in a given economy in response to higher returns. We also impose the following two restrictions on the model. First, we assume that individuals in the home economy, including the monopolist, have identical and homogeneous utility functions. Second, individuals in the home economy, other than the monopolist who is assumed not to possess quantities of either factor, possess identical endowments of both factors. The former assumption permits us to draw a community indifference map for the home economy that is independent of the distribution of income and also to make comparisons between the equilibria that result from different market structures.2 The latter assumption enables us to discern the corresponding changes in the real incomes of the factor owners. Since we assume throughout the analysis that perfect competition prevails in the foreign economy, the above restrictions on utility functions and factor ownership need not apply to it. We merely require here that, for whatever