Decarolis, FrancescoGoldmanis, MarisPenta, AntonioUniversitat Pompeu Fabra. Departament d'Economia i Empresa2020-05-252020-05-252019-04-12http://hdl.handle.net/10230/44763The transition of the advertising market from traditional media to the internet has induced a proliferation of marketing agencies specialized in bidding in the auctions that are used to sell ad space on the web. We analyze how collusive bidding can emerge from bid delegation to a common marketing agency and how this can undermine the revenues and allocative efficiency of both the Generalized Second Price auction (GSP, used by Google and Microsoft-Bing and Yahoo!) and the of VCG mechanism (used by Facebook). We find that, despite its well-known susceptibility to collusion, the VCG mechanism outperforms the GSP auction both in terms of revenues and efficiency.application/pdfengL'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative CommonsMarketing agencies and collusive bidding in online ad auctions<resourceType xmlns="http://datacite.org/schema/kernel-3" resourceTypeGeneral="Other">info:eu-repo/semantics/workingPaper</resourceType><subject xmlns="http://datacite.org/schema/kernel-3" subjectScheme="keyword">collusion</subject><subject xmlns="http://datacite.org/schema/kernel-3" subjectScheme="keyword">digital marketing agencies</subject><subject xmlns="http://datacite.org/schema/kernel-3" subjectScheme="keyword">facebook</subject><subject xmlns="http://datacite.org/schema/kernel-3" subjectScheme="keyword">google</subject><subject xmlns="http://datacite.org/schema/kernel-3" subjectScheme="keyword">gsp</subject><subject xmlns="http://datacite.org/schema/kernel-3" subjectScheme="keyword">internet auctions</subject><subject xmlns="http://datacite.org/schema/kernel-3" subjectScheme="keyword">online advertising</subject><subject xmlns="http://datacite.org/schema/kernel-3" subjectScheme="keyword">vcg</subject><subject xmlns="http://datacite.org/schema/kernel-3" subjectScheme="keyword">Microeconomics</subject><rights xmlns="http://datacite.org/schema/kernel-3">info:eu-repo/semantics/openAccess</rights>