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Horizontal mergers and successive oligopoly

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Abstract

This paper considers a successive oligopoly setting in which a set of upstream firms sell output non-exclusively to a group of downstream firms using a linear tariff. If the concavity of retail demand is constant then the profitability of horizontal merger at either the upstream or the downstream stage is shown to depend on the number of firms in the stage experiencing the merger and not on the number of firms in the other stage. Furthermore, the profitability of merger at either stage is the same as the profitability of merger amongst a set of vertically integrated firms in a setting in which all firms are vertically integrated. Finally, mergers at either stage are shown to reduce the sum of producer and consumer surplus. Moreover the negative effects of merger on surplus are unambiguously increased by increases in concentration in the merging stage and ambiguously affected by increases in concentration in the non-merging stage.

Suggested Citation

  • Steffen Ziss, 2005. "Horizontal mergers and successive oligopoly," Working Papers eg0041, Wilfrid Laurier University, Department of Economics, revised 2005.
    • Handle: RePEc:wlu:wpaper:eg0041
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    Cited by:

    1. Marie-Laure Allain & Saïd Souam, 2004. "Concentration horizontale et relations verticales," Working Papers hal-00242914, HAL.
    2. Ramon Fauli-Oller & Borja Mesa-Sánchez, 2015. "Losses from Horizontal Merger: an Extension to a Successive Oligopoly Model with Product Differentiation," Manchester School, University of Manchester, vol. 83(5), pages 604-621, September.
    3. Zhiyong Yao & Wen Zhou, 2011. "Endogenous Merger Waves in Vertically Related Industries," Working Papers 11-34, NET Institute.
    4. Gu, Dingwei & Huang, Yangguang, 2024. "Agency model versus wholesale model," Information Economics and Policy, Elsevier, vol. 68(C).
    5. Gjermund Nese & Odd Straume, 2007. "Industry Concentration and Strategic Trade Policy in Successive Oligopoly," Journal of Industry, Competition and Trade, Springer, vol. 7(1), pages 31-52, March.
    6. Tomomichi Mizuno, 2009. "Divisionalization And Horizontal Mergers In A Vertical Relationship," Manchester School, University of Manchester, vol. 77(3), pages 317-336, June.
    7. Arghya Ghosh & Hodaka Morita & Chengsi Wang, 2022. "Welfare Improving Horizontal Mergers in Successive Oligopoly," Journal of Industrial Economics, Wiley Blackwell, vol. 70(1), pages 89-118, March.
    8. Gjermund Nese & Odd Straume, 2007. "Industry Concentration and Strategic Trade Policy in Successive Oligopoly," Experimental Economics, Springer;Economic Science Association, vol. 7(1), pages 31-52, March.

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    Keywords

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    JEL classification:

    • L10 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - General
    • L20 - Industrial Organization - - Firm Objectives, Organization, and Behavior - - - General
    • L40 - Industrial Organization - - Antitrust Issues and Policies - - - General

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