According to Chamberlin, firms selling differentiated products and facing a downward sloping demand curve are in an industry described as

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Monopolistic competition. This is because in monopolistic competition, firms sell differentiated products and face a downward sloping demand curve due to their product differentiation. This sets them apart from firms in perfect competition who sell homogeneous products and face a perfectly elastic demand curve, and firms in oligopolistic competition who typically sell either differentiated or homogeneous products but face a kinked demand curve. There is no such thing as "semi-structured competition".

According to Chamberlin, Firms Selling Differentiated Products and Facing a Downward