The effect of income and performance on quit behavior is analyzed for professional tennis players. By means of players’ data from the 1985 season until the 2007 season of the ATP-Tour, a stratified Cox regression shows that a higher annual prize money and better performance (measured for...

The effects of the three-point rule in the first league German soccer are tested empirically and compared to games from the German cup competition. The inclusion of cup games ensures that changes in league games can be attributed to the three-point rule. As a result of their relative...