Estudo da eficiência dos times de futebol que mais investiram em jogadores para temporada 2008-2009

The aim of this paper is to investigate the efficiency of the 20 european football teams that most invested in players at season 2008-2009, considering the invested value and their results in championships. As analysis tool, was used the Data Envelopment Analysis (DEA), that had the purpose to compare the calculated efficiencies, identify goals to be reached by each team and the strategies used by possible benchmark opponents. For that, it was proposed two models. The first compared the teams’ performances by the point of view of the reached results in their national championships. However, in the second model, it was investigated the performance of these teams competing into the same championship, taking into account the teams in the previous model that had been classified for the Champions League 2008-2009.