The Welfare Effects of Third-Degree Price Discrimination in

Abstract

The author examines third-degree price discrimination by an upstream monopolist in an intermediate good market. Discrimination is motivated by the fact that downstream firms differ in their abilities to integrate backward into supply of the input. The author shows that under reasonable specifications of equilibrium, price discrimination leads to all buyers facing higher input prices. In other cases, discrimination raises some prices and lowers others. The author derives conditions under which discrimination lowers welfare by reducing total output and shows that in some markets discrimination will raise welfare by preventing socially inefficient backward integration. Copyright 1987 by American Economic Association.

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