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Price or Variety? An Evaluation of Mergers Effects in Grocery Retailing

Author

Listed:
  • Elena Argentesi
  • Paolo Buccirossi
  • Roberto Cervone
  • Tomaso Duso
  • Alessia Marrazzo
Abstract
Assortment decisions are key strategic instruments for firms responding to local market conditions. We assess this claim by studying the effect of a national merger between two large Dutch supermarket chains on prices and on the depth as well as composition of assortment. We adopt a difference-in-differences strategy that exploits local variation in the merger’s effects, controlling for selection on observables when defining our control group through a matching procedure. We show that the local change in competitive conditions due to the merger did not affect individual products’ prices but it led the merging parties to reposition their assortment and increase average category prices. While the low-variety and low-price target’s stores reduced the depth of their assortment when in direct competition with the acquirer’s stores, the latter increased their product variety. By analyzing the effect of the merger on category prices, we find that the target most likely dropped high priced products, while the acquirer added more of them. Thus, the merging firms reposition their product offerings in order to avoid cannibalization and lessen local competition. Further, we show that other dimensions of heterogeneity, such as market concentration, whether a divestiture was imposed by the Dutch competition authority, and the re-branding strategy of the target stores, are important for explaining the post-merger dynamics. A simple theoretical model of local-market variety competition explains most of our findings.

Suggested Citation

  • Elena Argentesi & Paolo Buccirossi & Roberto Cervone & Tomaso Duso & Alessia Marrazzo, 2018. "Price or Variety? An Evaluation of Mergers Effects in Grocery Retailing," Discussion Papers of DIW Berlin 1734, DIW Berlin, German Institute for Economic Research.
    • Handle: RePEc:diw:diwwpp:dp1734
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    References listed on IDEAS

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    More about this item

    Keywords

    Variety; assortment; mergers; ex-post evaluation; retail sector; supermarkets; grocery;
    All these keywords.

    JEL classification:

    • L1 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance
    • L41 - Industrial Organization - - Antitrust Issues and Policies - - - Monopolization; Horizontal Anticompetitive Practices
    • L66 - Industrial Organization - - Industry Studies: Manufacturing - - - Food; Beverages; Cosmetics; Tobacco
    • L81 - Industrial Organization - - Industry Studies: Services - - - Retail and Wholesale Trade; e-Commerce
    • D22 - Microeconomics - - Production and Organizations - - - Firm Behavior: Empirical Analysis
    • K21 - Law and Economics - - Regulation and Business Law - - - Antitrust Law
    • C23 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Models with Panel Data; Spatio-temporal Models

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