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- W3202531815 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. (JEL C45, D44, G34, L13, L81, M37)" @default.
- W3202531815 created "2021-10-11" @default.
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- W3202531815 date "2021-10-01" @default.
- W3202531815 modified "2023-10-12" @default.
- W3202531815 title "From Mad Men to Maths Men: Concentration and Buyer Power in Online Advertising" @default.
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- W3202531815 doi "https://doi.org/10.1257/aer.20190811" @default.
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