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Repeated Auctions with Budgets in Ad Exchanges: Approximations and Design

Author

Listed:
  • Santiago R. Balseiro

    (Fuqua School of Business, Duke University, Durham, North Carolina 27708)

  • Omar Besbes

    (Graduate School of Business, Columbia University, New York, New York 10027)

  • Gabriel Y. Weintraub

    (Graduate School of Business, Columbia University, New York, New York 10027)

Abstract

Ad exchanges are emerging Internet markets where advertisers may purchase display ad placements, in real time and based on specific viewer information, directly from publishers via a simple auction mechanism. Advertisers join these markets with a prespecified budget and participate in multiple second-price auctions over the length of a campaign. This paper studies the competitive landscape that arises in ad exchanges and the implications for publishers’ decisions. The presence of budgets introduces dynamic interactions among advertisers that need to be taken into account when attempting to characterize the bidding landscape or the impact of changes in the auction design. To this end, we introduce the notion of a fluid mean-field equilibrium (FMFE) that is behaviorally appealing and computationally tractable, and in some important cases, it yields a closed-form characterization. We establish that an FMFE approximates well the rational behavior of advertisers in these markets. We then show how this framework may be used to provide sharp prescriptions for key auction design decisions that publishers face in these markets. In particular, we show that ignoring budgets, a common practice in this literature, can result in significant profit losses for the publisher when setting the reserve price. This paper was accepted by Dimitris Bertsimas, optimization .

Suggested Citation

  • Santiago R. Balseiro & Omar Besbes & Gabriel Y. Weintraub, 2015. "Repeated Auctions with Budgets in Ad Exchanges: Approximations and Design," Management Science, INFORMS, vol. 61(4), pages 864-884, April.
    • Handle: RePEc:inm:ormnsc:v:61:y:2015:i:4:p:864-884
    DOI: 10.1287/mnsc.2014.2022
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