Since the beginning of the nineties, professional sports firm values have been estimated by American newspapers. In 2004, Forbes proposed for the first time a list of the most valuable European soccer teams. In this article, we compare the determinants of firm values in MLB, the NBA, NFL, NHL, and European soccer over the period 2004-2011. The results show only one variable for which the sign and significance are the same for all the leagues: historical sports performance, with a significantly positive impact in each league. The comparison between the United States and Europe reveals that...Read more