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From Mad Men to Maths Men: Concentration and Buyer Power in Online Advertising

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  • Francesco Decarolis
  • Gabriele Rovigatti

Abstract

This paper analyzes the impact of intermediary concentration on the allocation of revenue in online platforms. We study sponsored search documenting how advertisers increasingly bid through a handful of specialized intermediaries. This enhances automated bidding and data pooling, but lessens competition whenever the intermediary represents competing advertisers. Using data on nearly 40 million Google keyword auctions, we first apply machine learning algorithms to cluster keywords into thematic groups serving as relevant markets. Using an instrumental variable strategy, we estimate a decline in the platform's revenue of approximately 11 percent due to the average rise in concentration associated with intermediary merger and acquisition activity.

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  • Francesco Decarolis & Gabriele Rovigatti, 2021. "From Mad Men to Maths Men: Concentration and Buyer Power in Online Advertising," American Economic Review, American Economic Association, vol. 111(10), pages 3299-3327, October.
    • Handle: RePEc:aea:aecrev:v:111:y:2021:i:10:p:3299-3327
    DOI: 10.1257/aer.20190811
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    Cited by:

    1. Motta, Massimo & Penta, Antonio, 2022. "Market Effects of Sponsored Search Auctions," TSE Working Papers 22-1370, Toulouse School of Economics (TSE).
    2. Shota Ichihashi & Alex Smolin, 2023. "Buyer-Optimal Algorithmic Consumption," Papers 2309.12122, arXiv.org, revised Sep 2024.
    3. Francesco Decarolis & Maris Goldmanis & Antonio Penta & Ksenia Shakhgildyan, 2023. "Bid Coordination in Sponsored Search Auctions: Detection Methodology and Empirical Analysis," Journal of Industrial Economics, Wiley Blackwell, vol. 71(2), pages 570-592, June.
    4. Wei Zhou & Zidong Wang, 2020. "Competing for Search Traffic in Query Markets: Entry Strategy, Platform Design, and Entrepreneurship," Working Papers 20-12, NET Institute.
    5. Joo, Mingyu & Kim, Seung Hyun & Ghose, Anindya & Wilbur, Kenneth C., 2023. "Designing Distributed Ledger technologies, like Blockchain, for advertising markets," International Journal of Research in Marketing, Elsevier, vol. 40(1), pages 12-21.
    6. Brett R Gordon & Kinshuk Jerath & Zsolt Katona & Sridhar Narayanan & Jiwoong Shin & Kenneth C Wilbur, 2019. "Inefficiencies in Digital Advertising Markets," Papers 1912.09012, arXiv.org, revised Feb 2020.
    7. Stephanie Assad & Robert Clark & Daniel Ershov & Lei Xu, 2020. "Algorithmic Pricing and Competition: Empirical Evidence from the German Retail Gasoline Market," CESifo Working Paper Series 8521, CESifo.
    8. Joan Calzada & Nestor Duch-Brown & Ricard Gil, 2021. "Do search engines increase concentration in media markets?," UB School of Economics Working Papers 2021/415, University of Barcelona School of Economics.
    9. Marcel Wieting & Geza Sapi, 2021. "Algorithms in the Marketplace: An Empirical Analysis of Automated Pricing in E-Commerce," Working Papers 21-06, NET Institute.
    10. Ajit Desai, 2023. "Machine Learning for Economics Research: When What and How?," Papers 2304.00086, arXiv.org, revised Apr 2023.
    11. Zhang, Xiaoqian & Huang, Bin, 2022. "Does bank competition inhibit the formation of zombie firms?," International Review of Economics & Finance, Elsevier, vol. 80(C), pages 1045-1060.
    12. Kittaka, Yuta & Sato, Susumu & Zennyo, Yusuke, 2023. "Self-preferencing by platforms: A literature review," Japan and the World Economy, Elsevier, vol. 66(C).
    13. Sviták, Jan & Tichem, Jan & Haasbeek, Stefan, 2021. "Price effects of search advertising restrictions," International Journal of Industrial Organization, Elsevier, vol. 77(C).
    14. Maximilian Schäfer & Geza Sapi, 2020. "Learning from Data and Network Effects: The Example of Internet Search," Discussion Papers of DIW Berlin 1894, DIW Berlin, German Institute for Economic Research.

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    More about this item

    JEL classification:

    • C45 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods: Special Topics - - - Neural Networks and Related Topics
    • D44 - Microeconomics - - Market Structure, Pricing, and Design - - - Auctions
    • G34 - Financial Economics - - Corporate Finance and Governance - - - Mergers; Acquisitions; Restructuring; Corporate Governance
    • L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets
    • L81 - Industrial Organization - - Industry Studies: Services - - - Retail and Wholesale Trade; e-Commerce
    • M37 - Business Administration and Business Economics; Marketing; Accounting; Personnel Economics - - Marketing and Advertising - - - Advertising

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