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The Impact of Retail Mergers on Food Prices: Evidence from France

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  • Marie-Laure Allain

    (X-DEP-ECO - Département d'Économie de l'École Polytechnique - X - École polytechnique - IP Paris - Institut Polytechnique de Paris, CREST - Centre de Recherche en Économie et Statistique - ENSAI - Ecole Nationale de la Statistique et de l'Analyse de l'Information [Bruz] - X - École polytechnique - IP Paris - Institut Polytechnique de Paris - ENSAE Paris - École Nationale de la Statistique et de l'Administration Économique - CNRS - Centre National de la Recherche Scientifique)

  • Claire Chambolle

    (X-DEP-ECO - Département d'Économie de l'École Polytechnique - X - École polytechnique - IP Paris - Institut Polytechnique de Paris)

  • Stéphane Turolla

    (SMART-LERECO - Structures et Marché Agricoles, Ressources et Territoires - INRA - Institut National de la Recherche Agronomique - AGROCAMPUS OUEST)

  • Sofia Villas-Boas

    (LBNL - Lawrence Berkeley National Laboratory [Berkeley])

Abstract

This paper analyzes the impact of a merger in the French retail sector on food prices, using a consumer panel data. We perform a di fference-in-diff erences analysis by comparing price changes in stores for which the local market structure is aff ected by the merger to unaff ected stores. In addition, we empirically investigate economic forces behind the observed price changes. On average, we fi nd that the merger signifi cantly raised competitors' prices contemporaneously with merging firms' price increases. Further, we show that competitor prices increase more in local markets that experience larger structural changes in concentration and chain diff erentiation.

Suggested Citation

  • Marie-Laure Allain & Claire Chambolle & Stéphane Turolla & Sofia Villas-Boas, 2013. "The Impact of Retail Mergers on Food Prices: Evidence from France," Working Papers hal-00920460, HAL.
    • Handle: RePEc:hal:wpaper:hal-00920460
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    1. Stéphane Turolla, 2016. "Spatial Competition in the French Supermarket Industry," Annals of Economics and Statistics, GENES, issue 121-122, pages 213-259.
    2. Davis David E., 2010. "Prices, Promotions, and Supermarket Mergers," Journal of Agricultural & Food Industrial Organization, De Gruyter, vol. 8(1), pages 1-27, November.
    3. Joshua D. Angrist & Jörn-Steffen Pischke, 2010. "The Credibility Revolution in Empirical Economics: How Better Research Design Is Taking the Con out of Econometrics," Journal of Economic Perspectives, American Economic Association, vol. 24(2), pages 3-30, Spring.
    4. Allain, Marie-Laure & Chambolle, Claire, 2011. "Anti-competitive effects of resale-below-cost laws," International Journal of Industrial Organization, Elsevier, vol. 29(4), pages 373-385, July.
    5. Philippe Choné & Laurent Linnemer, 2012. "A Treatment Effect Method for Merger Analysis with an Application to Parking Prices in P aris," Journal of Industrial Economics, Wiley Blackwell, vol. 60(4), pages 631-656, December.
    6. Christos Genakos & Tommaso Valletti, 2011. "Testing The “Waterbed” Effect In Mobile Telephony," Journal of the European Economic Association, European Economic Association, vol. 9(6), pages 1114-1142, December.
    7. Christopher T. Taylor & Daniel S. Hosken, 2007. "The Economic Effects Of The Marathon‐Ashland Joint Venture: The Importance Of Industry Supply Shocks And Vertical Market Structure," Journal of Industrial Economics, Wiley Blackwell, vol. 55(3), pages 419-451, September.
    8. Justine S. Hastings & Richard J. Gilbert, 2005. "Market Power, Vertical Integration And The Wholesale Price Of Gasoline," Journal of Industrial Economics, Wiley Blackwell, vol. 53(4), pages 469-492, December.
    9. repec:bla:scandj:v:104:y:2002:i:4:p:547-66 is not listed on IDEAS
    10. Aviv Nevo, 2000. "Mergers with Differentiated Products: The Case of the Ready-to-Eat Cereal Industry," RAND Journal of Economics, The RAND Corporation, vol. 31(3), pages 395-421, Autumn.
    11. Pierre Biscourp & Xavier Boutin & Thibaud Vergé, 2013. "The Effects of Retail Regulations on Prices: Evidence from the Loi Galland," Economic Journal, Royal Economic Society, vol. 123(12), pages 1279-1312, December.
    12. Verboven, Frank & Björnerstedt, Jonas, 2012. "Does Merger Simulation Work? A "Natural Experiment" in the Swedish Analgesics Market Market," CEPR Discussion Papers 9027, C.E.P.R. Discussion Papers.
    13. Wioletta Dziuda & Giovanni Mastrobuoni, 2009. "The Euro Changeover and Its Effects on Price Transparency and Inflation," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 41(1), pages 101-129, February.
    14. Keisuke Hirano & Guido W. Imbens & Geert Ridder, 2003. "Efficient Estimation of Average Treatment Effects Using the Estimated Propensity Score," Econometrica, Econometric Society, vol. 71(4), pages 1161-1189, July.
    15. Marianne Bertrand & Francis Kramarz, 2002. "Does Entry Regulation Hinder Job Creation? Evidence from the French Retail Industry," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 117(4), pages 1369-1413.
    16. Luca Aguzzoni & Elena Argentesi & Lorenzo Ciari & Tomaso Duso & Massimo Tognoni, 2016. "Ex post Merger Evaluation in the U.K. Retail Market for Books," Journal of Industrial Economics, Wiley Blackwell, vol. 64(1), pages 170-200, March.
    17. Stephen W. Salant & Sheldon Switzer & Robert J. Reynolds, 1983. "Losses From Horizontal Merger: The Effects of an Exogenous Change in Industry Structure on Cournot-Nash Equilibrium," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 98(2), pages 185-199.
    18. Jerry Hausman & Ephraim Leibtag, 2007. "Consumer benefits from increased competition in shopping outlets: Measuring the effect of Wal-Mart," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 22(7), pages 1157-1177.
    19. Orley Ashenfelter & Daniel Hosken & Matthew Weinberg, 2014. "Did Robert Bork Understate the Competitive Impact of Mergers? Evidence from Consummated Mergers," Journal of Law and Economics, University of Chicago Press, vol. 57(S3), pages 67-100.
    20. Orley C. Ashenfelter & Daniel S. Hosken & Matthew C. Weinberg, 2013. "The Price Effects of a Large Merger of Manufacturers: A Case Study of Maytag-Whirlpool," American Economic Journal: Economic Policy, American Economic Association, vol. 5(1), pages 239-261, February.
    21. Steven C. Salop, 1979. "Monopolistic Competition with Outside Goods," Bell Journal of Economics, The RAND Corporation, vol. 10(1), pages 141-156, Spring.
    22. Roman Inderst & Tommaso M. Valletti, 2011. "Buyer Power And The ‘Waterbed Effect’," Journal of Industrial Economics, Wiley Blackwell, vol. 59(1), pages 1-20, March.
    23. Howard Smith, 2004. "Supermarket Choice and Supermarket Competition in Market Equilibrium," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 71(1), pages 235-263.
    24. Orley C. Ashenfelter & Daniel S. Hosken & Matthew C. Weinberg, 2015. "Efficiencies brewed: pricing and consolidation in the US beer industry," RAND Journal of Economics, RAND Corporation, vol. 46(2), pages 328-361, June.
    25. Haucap, Justus & Heimeshoff, Ulrich & Klein, Gordon J. & Rickert, Dennis & Wey, Christian, 2013. "Inter-format competition among retailers: The role of private label products in market delineation," DICE Discussion Papers 101, Heinrich Heine University Düsseldorf, Düsseldorf Institute for Competition Economics (DICE).
    26. Perry, Martin K & Porter, Robert H, 1985. "Oligopoly and the Incentive for Horizontal Merger," American Economic Review, American Economic Association, vol. 75(1), pages 219-227, March.
    27. Cotterill, Ronald W, 1986. "Market Power in the Retail Food Industry: Evidence from Vermont," The Review of Economics and Statistics, MIT Press, vol. 68(3), pages 379-386, August.
    28. Dario Focarelli & Fabio Panetta, 2003. "Are Mergers Beneficial to Consumers? Evidence from the Market for Bank Deposits," American Economic Review, American Economic Association, vol. 93(4), pages 1152-1172, September.
    29. Marianne Bertrand & Esther Duflo & Sendhil Mullainathan, 2004. "How Much Should We Trust Differences-In-Differences Estimates?," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 119(1), pages 249-275.
    30. Marcus Asplund & Richard Friberg, 2002. "Food Prices and Market Structure in Sweden," Scandinavian Journal of Economics, Wiley Blackwell, vol. 104(4), pages 547-566, December.
    31. Matthew C. Weinberg & Daniel Hosken, 2013. "Evidence on the Accuracy of Merger Simulations," The Review of Economics and Statistics, MIT Press, vol. 95(5), pages 1584-1600, December.
    32. Jean-Francois Houde, 2012. "Spatial Differentiation and Vertical Mergers in Retail Markets for Gasoline," American Economic Review, American Economic Association, vol. 102(5), pages 2147-2182, August.
    33. Aviv Nevo & Michael D. Whinston, 2010. "Taking the Dogma out of Econometrics: Structural Modeling and Credible Inference," Journal of Economic Perspectives, American Economic Association, vol. 24(2), pages 69-82, Spring.
    34. Guido W. Imbens, 2004. "Nonparametric Estimation of Average Treatment Effects Under Exogeneity: A Review," The Review of Economics and Statistics, MIT Press, vol. 86(1), pages 4-29, February.
    35. Justine S. Hastings, 2004. "Vertical Relationships and Competition in Retail Gasoline Markets: Empirical Evidence from Contract Changes in Southern California," American Economic Review, American Economic Association, vol. 94(1), pages 317-328, March.
    36. Emek Basker & Michael Noel, 2009. "The Evolving Food Chain: Competitive Effects of Wal‐Mart's Entry into the Supermarket Industry," Journal of Economics & Management Strategy, Wiley Blackwell, vol. 18(4), pages 977-1009, December.
    37. Bruce Marion, 1998. "Competition in Grocery Retailing: The Impact of a New Strategic Group on BLS Price Increases," Review of Industrial Organization, Springer;The Industrial Organization Society, vol. 13(4), pages 381-399, August.
    38. Pierre Biscourp & Xavier Boutin & Thibaud Vergé, 2013. "The Effects of Retail Regulations on Prices: Evidence from the Loi Galland," Economic Journal, Royal Economic Society, vol. 123(12), pages 1279-1312, December.
    39. Orley Ashenfelter & Daniel Hosken, 2010. "The Effect of Mergers on Consumer Prices: Evidence from Five Mergers on the Enforcement Margin," Journal of Law and Economics, University of Chicago Press, vol. 53(3), pages 417-466.
    40. Newmark, Craig M., 1990. "A new test of the price-concentration relationship in grocery retailing," Economics Letters, Elsevier, vol. 33(4), pages 369-373, August.
    41. Orley Ashenfelter & David Ashmore & Jonathan Baker & Suzanne Gleason & Daniel Hosken, 2006. "Empirical Methods in Merger Analysis: Econometric Analysis of Pricing in FTC v. Staples," International Journal of the Economics of Business, Taylor & Francis Journals, vol. 13(2), pages 265-279.
    42. Ronald Cotterill & William Putsis, 2000. "Market Share and Price Setting Behavior for Private Labels and National Brands," Review of Industrial Organization, Springer;The Industrial Organization Society, vol. 17(1), pages 17-39, August.
    43. Maican, Florin & Orth, ´Matilda, 2013. "Entry Regulations, Product Differentiation and Determinants of Market Structure," Working Paper Series 984, Research Institute of Industrial Economics.
    44. Davis, David E., 2009. "Price and promotion effects of supermarket mergers," SDSU Working Papers in Progress 12009, South Dakota State University, Department of Economics, revised Jun 2010.
    45. Levy, David T & Reitzes, James D, 1992. "Anticompetitive Effects of Mergers in Markets with Localized Competition," The Journal of Law, Economics, and Organization, Oxford University Press, vol. 8(2), pages 427-440, April.
    46. Matthew Weinberg, 2008. "The Price Effects Of Horizontal Mergers," Journal of Competition Law and Economics, Oxford University Press, vol. 4(2), pages 433-447.
    47. Barros, Pedro Pita & Brito, Duarte & de Lucena, Diogo, 2006. "Mergers in the food retailing sector: An empirical investigation," European Economic Review, Elsevier, vol. 50(2), pages 447-468, February.
    48. Roman Inderst & Greg Shaffer, 2007. "Retail Mergers, Buyer Power and Product Variety," Economic Journal, Royal Economic Society, vol. 117(516), pages 45-67, January.
    49. McAfee, R Preston & Williams, Michael A, 1992. "Horizontal Mergers and Antitrust Policy," Journal of Industrial Economics, Wiley Blackwell, vol. 40(2), pages 181-187, June.
    50. Fabio Panetta & Dario Focarelli, 2003. "Are Mergers Beneficial to Consumers? Evidence from the Italian Market for Bank Deposits," CEIS Research Paper 10, Tor Vergata University, CEIS.
    51. Matthew C. Weinberg, 2011. "More Evidence on the Performance of Merger Simulations," American Economic Review, American Economic Association, vol. 101(3), pages 51-55, May.
    52. von Ungern-Sternberg, Thomas, 1996. "Countervailing power revisited," International Journal of Industrial Organization, Elsevier, vol. 14(4), pages 507-519, June.
    53. Amit Gandhi & Luke Froeb & Steven Tschantz & Gregory J. Werden, 2008. "Post‐Merger Product Repositioning," Journal of Industrial Economics, Wiley Blackwell, vol. 56(1), pages 49-67, March.
    54. Paul W. Dobson & Michael Waterson, 2005. "Chain‐Store Pricing Across Local Markets," Journal of Economics & Management Strategy, Wiley Blackwell, vol. 14(1), pages 93-119, March.
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    Cited by:

    1. Elena Argentesi & Paolo Buccirossi & Roberto Cervone & Tomaso Duso & Alessia Marrazzo, 2018. "Price or Variety? An Evaluation of Mergers Effects in Grocery Retailing," CESifo Working Paper Series 7035, CESifo.
    2. Brian Adams & Kevin R. Williams, 2019. "Zone Pricing in Retail Oligopoly," American Economic Journal: Microeconomics, American Economic Association, vol. 11(1), pages 124-156, February.
    3. Luca Aguzzoni & Elena Argentesi & Lorenzo Ciari & Tomaso Duso & Massimo Tognoni, 2016. "Ex post Merger Evaluation in the U.K. Retail Market for Books," Journal of Industrial Economics, Wiley Blackwell, vol. 64(1), pages 170-200, March.
    4. Metin Çakır & William G. Secor, 2018. "Heterogeneous impacts from a retail grocery acquisition: Do national and store brand prices respond differently?," Agribusiness, John Wiley & Sons, Ltd., vol. 34(3), pages 524-541, June.
    5. Cakir, Metin & Balagtas, Joseph Valdes & Okrent, Abigail M., 2014. "The impact of package size on consumption," 2014 International Congress, August 26-29, 2014, Ljubljana, Slovenia 182776, European Association of Agricultural Economists.
    6. Argentesi, Elena & Buccirossi, Paolo & Cervone, Roberto & Duso, Tomaso & Marrazzo, Alessia, 2021. "The effect of mergers on variety in grocery retailing," International Journal of Industrial Organization, Elsevier, vol. 79(C).
    7. Ralph B. Siebert, 2019. "Estimating Differential Dynamic Merger Effects on Market Structure and Entry in Related Markets," Review of Industrial Organization, Springer;The Industrial Organization Society, vol. 55(3), pages 431-458, November.
    8. Daniel S. Hosken & Luke M. Olson & Loren K. Smith, 2018. "Do retail mergers affect competition? Evidence from grocery retailing," Journal of Economics & Management Strategy, Wiley Blackwell, vol. 27(1), pages 3-22, March.
    9. Dennis Rickert & Jan Philip Schain & Joel Stiebale, 2021. "Local Market Structure and Consumer Prices: Evidence from a Retail Merger," Journal of Industrial Economics, Wiley Blackwell, vol. 69(3), pages 692-729, September.
    10. Orley Ashenfelter & Daniel Hosken & Matthew Weinberg, 2014. "Did Robert Bork Understate the Competitive Impact of Mergers? Evidence from Consummated Mergers," Journal of Law and Economics, University of Chicago Press, vol. 57(S3), pages 67-100.
    11. Franco Mariuzzo & Peter L. Ormosi, 2017. "Post-merger price dynamics matter, so why do merger retrospectives ignore them?," Working Paper series, University of East Anglia, Centre for Competition Policy (CCP) 2016-05, Centre for Competition Policy, University of East Anglia, Norwich, UK..
    12. Secor, William & Çakır, Metin, 2016. "Impacts from a retail grocery acquisition: Do national and store brand prices respond differently?," 2016 Annual Meeting, July 31-August 2, Boston, Massachusetts 235945, Agricultural and Applied Economics Association.
    13. Argentesi, Elena & Buccirossi, Paolo & Cervone, Roberto & Duso, Tomaso & Marrazzo, Alessia, 2016. "The effect of retail mergers on prices and variety: An ex-post evaluation," DICE Discussion Papers 225, Heinrich Heine University Düsseldorf, Düsseldorf Institute for Competition Economics (DICE).
    14. Metin Çakır & Joseph V. Balagtas & Abigail M. Okrent & Mariana Urbina‐Ramirez, 2021. "Effects of Package Size on Household Food Purchases," Applied Economic Perspectives and Policy, John Wiley & Sons, vol. 43(2), pages 781-801, June.
    15. Rebecca Cleary & Lauren Chenarides, 2022. "Food retail profits, competition, and the Great Recession," Agribusiness, John Wiley & Sons, Ltd., vol. 38(3), pages 557-578, July.

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    More about this item

    Keywords

    Difference-in-differences; Ex-post merger evaluation; Retail grocery sector;
    All these keywords.

    JEL classification:

    • K21 - Law and Economics - - Regulation and Business Law - - - Antitrust Law
    • L11 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Production, Pricing, and Market Structure; Size Distribution of Firms
    • L66 - Industrial Organization - - Industry Studies: Manufacturing - - - Food; Beverages; Cosmetics; Tobacco

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