On price competition with complementary goods Jean Gabszewicz, CORE, Universit´ e catholique de Louvain, Nathalie Sonnac, CREST/LEI, Paris, Xavier Wauthy, CEREC, Facult´ es universitaires Saint-Louis Bruxelles and CORE April 2000 Abstract We consider a duopoly industry with two separate firms each selling an indivisible product. The joint consumption of these goods has a spe- cific value for the consumers which exceeds the mere addition of utilities when products are consumed in isolation: the higher this excess, the larger the complementarity between the goods. We analyse price equi- libria in this market as related to the degree of complementarity existing between the two products. JEL codes: L13 Keywords: