Consumer surplus and CES demand

Thijs ten Raa

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)


This article presents the consumer surplus formula for constant elasticity of substitution (CES) demands. The formula is used to compare the monopoly and optimum provisions of product variety. It is shown that a monopolist under-provides variety. This result is contrasted with Lambertini’s analysis of the monopolist’s optimal R&D portfolio. I also contrast my approach with the indirect utility technique of Anderson, de Palma, and Thisse’s discrete choice theory of product differentiation.
Original languageEnglish
Pages (from-to)1165-1173
JournalOxford Economic Papers
Issue number4
Publication statusPublished - Oct 2015


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