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Prices and Concentration: A U-Shape? Theory and Evidence from Renewables

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  • Michele Fioretti

    (ECON - Département d'économie (Sciences Po) - Sciences Po - Sciences Po - CNRS - Centre National de la Recherche Scientifique)

  • Junnan He

    (ECON - Département d'économie (Sciences Po) - Sciences Po - Sciences Po - CNRS - Centre National de la Recherche Scientifique)

  • Jorge Tamayo

    (Harvard University, Harvard Business School - Harvard University, Digital Reskilling Lab - D^3 - Digital Data Design Institute - HBS - Harvard Business School)

Abstract

We study firms' strategic interactions when each firm may own multiple production technologies, each with its own marginal cost and capacity. Increasing industry concentration by reallocating non-efficient capacity to the largest and most efficient firm can decrease market prices as it incentivizes the firm to outcompete its rivals. However, with large reallocations, the standard monotonic relationship between concentration and prices re-emerges as competition weakens due to the rival's lower capacity. Thus, we demonstrate a U shaped relationship between market prices and industry concentration when firms are diversified. This result does not rely on economies of scale or scope. We find consistent evidence from the Colombian wholesale energy market, where strategic firms are diversified with fossil-fuel and renewable technologies, exploiting exogenous variation in renewable capacities. Our findings not only apply to the green transition but also to other industries and suggest new insights for antitrust policies.

Suggested Citation

  • Michele Fioretti & Junnan He & Jorge Tamayo, 2024. "Prices and Concentration: A U-Shape? Theory and Evidence from Renewables," SciencePo Working papers Main hal-04631762, HAL.
    • Handle: RePEc:hal:spmain:hal-04631762
    Note: View the original document on HAL open archive server: https://sciencespo.hal.science/hal-04631762
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