Price and Variety in the Spokes Model

Yongmin Chen and Michael Riordan

Economic Journal, 2007, vol. 117, issue 522, 897-921

Abstract: The spokes model of nonlocalised spatial competition provides a new analytical tool for differentiated oligopoly and a representation of spatial monopolistic competition. An increase in the number of firms leads to lower equilibrium prices when consumers have relatively high product valuations, but, surprisingly, to higher equilibrium prices for intermediate consumer valuations. New entry alters consumer and social welfare through price, market expansion, and matching effects. With free entry, the market may provide too many or too few varieties from a social welfare perspective, and the equilibrium price remains above marginal cost even when the number of firms is arbitrarily large. Copyright 2007 The Author(s). Journal compilation Royal Economic Society 2007.

Date: 2007
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