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How (not) to measure competition

Author

Listed:
  • Jan Boone

    (CPB Netherlands Bureau for Economic Policy Analysis)

  • Henry van der Wiel
  • J. van Ours
Abstract
We discuss and apply a new measure of competition: the elasticity of a firm's profits with respect to its cost level. A higher value of this profit elasticity (PE) signals more intense competition. Using firm level data we compare PE with the most popular competition measures such as the price cost margin (PCM). We show that PE and PCM are highly correlated on average. However, PCM tends to misrepresent the development of competition over time in markets with few firms and high concentration, i.e. in markets with high relevance for competition policy and regulation. So, just when it is needed the most PCM fails whereas PE does not. From this, we conclude that PE is a more reliable measure of competition.

Suggested Citation

  • Jan Boone & Henry van der Wiel & J. van Ours, 2007. "How (not) to measure competition," CPB Discussion Paper 91, CPB Netherlands Bureau for Economic Policy Analysis.
  • Handle: RePEc:cpb:discus:91
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    References listed on IDEAS

    as
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    More about this item

    JEL classification:

    • D43 - Microeconomics - - Market Structure, Pricing, and Design - - - Oligopoly and Other Forms of Market Imperfection
    • L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets

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