Is there more than one critical concentration ratio? An empirical test for the Portland cement industry

Azzeddine M. Azzam, David I. Rosenbaum, Ananda Weliwita

Research output: Contribution to journalArticle

5 Scopus citations


Past attempts to estimate the critical concentration ratio maintained the hypothesis of only two structural groupings: competitive versus non-competitive. In view of the spectrum of competitive conduct allowed by oligopoly theory, the validity of the two groupings is restrictive and should be tested. Using data from the Portland cement industry, this paper conducts such a test, employing a non-linear switching regression technique based on the logistic function. The hypothesis of two structural groupings is not rejected.

Original languageEnglish (US)
Pages (from-to)673-678
Number of pages6
JournalApplied Economics
Issue number6
StatePublished - Jun 1996


ASJC Scopus subject areas

  • Economics and Econometrics

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