Affiliation, equilibrium existence and the revenue ranking of auctions
We consider private value auctions where bidders’ types are dependent, a case usually treated by assuming affiliation. We show that affiliation is a restrictive assumption in three senses: topological, measure-theoretic and statistical (affiliation is a very restrictive characterization of positive...
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2007 |
| País: | Brasil |
| Recursos: | Fundação Getulio Vargas (FGV) |
| Repositório: | Repositório Institucional do FGV (FGV Repositório Digital) |
| Idioma: | inglês |
| OAI Identifier: | oai:repositorio.fgv.br:10438/12481 |
| Acesso em linha: | http://hdl.handle.net/10438/12481 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Auctions Affiliation Dependence of types Pure strategy equilibrium Revenue ranking Economia Leilões |
| Resumo: | We consider private value auctions where bidders’ types are dependent, a case usually treated by assuming affiliation. We show that affiliation is a restrictive assumption in three senses: topological, measure-theoretic and statistical (affiliation is a very restrictive characterization of positive dependence). We also show that affiliation’s main implications do not generalize for alternative definitions of positive dependence. From this, we propose new approaches to the problems of pure strategy equilibrium existence in first-price auctions (PSEE) and the characterization of the revenue ranking of auctions. For equilibrium existence, we slightly restrict the set of distributions considered, without loss of economic generality, and offer a complete characterization of PSEE. For revenue ranking, we obtain a characterization of the expected revenue differences between second and first price auctions with general dependence of types. |
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