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Concentration vs Inequality Measures of Market Structure
This paper compares market structure in different industries using conventional additive measures and various indices of firm size inequality. It is found that levels or changes in market structure are not exactly consistent across various measures. However, as compared to additive measures, inequality indices give more consistent results, and hence can be used to examine the structure of markets in different industries. Nonetheless, since there are inconsistencies across different inequality indices, efforts should be made towards formulating a suitable criterion for selecting the most appropriate measure.
The authors are grateful to Rakesh Basant for having useful discussions at the early stage of writing this paper. The authors are also thankful to an anonymous referee of this journal for valuable comments and suggestions. Usual disclaimers apply.
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