The importance of industry classification in estimating concentration ratios

Karel Hrazdil and Ray Zhang

Economics Letters, 2012, vol. 114, issue 2, 224-227

Abstract: We compare different industry concentration ratios based on the Standard Industry Classification (SIC) system to ratios based on the Global Industry Classification Standard (GICS) system and demonstrate through the analysis of industry markups that GICS-based measures are better proxies for the actual industry concentration than SIC-based measures.

Keywords: Industry; Concentration; Markup; SIC; GICS (search for similar items in EconPapers)
JEL-codes: C80 D40 (search for similar items in EconPapers)
Date: 2012
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Citations: View citations in EconPapers (14)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:ecolet:v:114:y:2012:i:2:p:224-227

DOI: 10.1016/j.econlet.2011.10.001

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