We present an empirical investigation of the role of marketing agencies in Google's online ad auctions. By combining … data on advertisers' affiliation to marketing agencies with data on bidding in ad auctions, we analyze how changes in the …

other business buyers. Using a proprietary dataset of secondary market auctions hosted on an online B2B platform, we study … how market pricing information from other auctions for comparable products a ffects the bidding behavior of the first … behavior and concurrent prices, formed from other open and just-finished auctions relative to the focal auction. We also study …