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In this paper we show that a homogeneous-product market with multiple Bertrand equilibria becomes a market with a single Bertrand equilibrium when we introduce a small degree of product differentiation. When differentiation tends to zero, that Bertrand equilibrium converges to the unique competitive equilibrium of the homogeneous-product market, which is in turn one of the multiple Bertrand equilibria for that market. Resumen en este trabajo se muestra que un mercado de un producto homogéneo,doi:10.4067/s0718-88702009000100003 fatcat:hatzxre7ajdijb6w2waltsszre