More goals when supporters are allowed to go to the Ajax-Feyenoord rivalry
The influence of “the 12th man” exists, as Philip Hans Franses, Professor of Econometrics at Erasmus School of Economics and ERIM Fellow, proves. Franses has discovered that football players from Ajax and Feyenoord perform less well without their own supporters on the tribune during the "klassieker" (Ajax-Feyenoord rivalry). ‘Apparently, accompanying supporters has a motivating effect. Encouraging seems to make sense.’