Market Concentration and the Analysis of Vertical Organization

Jean-Paul Chavas, Guanming Shi


This paper proposes concentration indices that extend the classical Hirschman-Herfindahl Index to include vertical structures for differentiated products. The analysis shows how cross-product substitution/complementarity relationships across vertical channels can affect pricing. It also identifies the role played by market size. The usefulness of the approach is illustrated in an application to a merger analysis in the gasoline market.

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International Journal of Marketing Studies  ISSN 1918-719X(Print) ISSN 1918-7203(Online)

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