A Buyer-Based Measure of Seller Concentration
MATHEMATICS(2022)
摘要
In most markets, buyers differ in their ability or willingness to switch supplier. This note proposes a novel industry concentration measure that takes this heterogeneity into account. The index increases in the share of captive sales, coincides with the Hirschman-Herfindahl Index when none of the buyers are captive, and takes the "pure monopoly" value of 1 when all are captive.
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关键词
captive consumers, concentration ratio, Hirschman-Herfindahl Index, market structure, seller concentration
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