The Attention Economy of Online Advertising∗
The Attention Economy of Online Advertising∗ Alexander Whitey Kamal Jainz July 23, 2019 Abstract Internet users often surf to multiple websites in order to accomplish a single task. When this happens, do these different sites face the right incentives when choosing their advertising policies? We build a model showing that websites face an interesting tradeoff: on the one hand, they are prone to over-advertise (similar to double marginalization); on the other hand, they tend to misallocate ads across sites (a distortion we call misplacement). Standard solutions to the double marginalization problem, such as adding competition among certain sites, make the misplacement problem more severe. This tradeoff is important for news aggregators and social networks, as it affects their decisions whether to link to external content providers or to expand the amount of content they offer by themselves. Understanding these incentives helps to inform the current debate regarding the concentration of influence among a small set of online platforms. Keywords: Platforms, Advertising, Misplacement, Market Power JEL Codes: D21, D40, L23, L42, L86 ∗We thank seminar audiences at the U.S. Federal Communications Commission, the University of Virginia, the University of Miami, Peking University and Hong Kong University as well as Simon Anderson, Gary Biglaiser, Marc Bourreau, Denis Charles, Jacques Cremer,´ Eric Horvitz, Bruno Jullien, Chris Meek, Martin Peitz, Paul Seabright, Sven Seuken, Wing Suen, Thomas Tregouet, Glen Weyl and Mike Whinston for comments/discussions, Yunhao Huang, Keyan Li and Lingxuan “Sean” Wu for exceptional research assistance. White acknowledges financial support for this research from the Chaire Orange de l’innovation & r´egulation.
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