Why not try to understand the football market structure? All footballers can be seen as price-differentiated products, or they can be seen as monopolistically competitive. Obviously there is no perfect competition but all the global young raw talent makes the market contestable. No one player has total control of the market, therefore there is no monopoly or oligopoly, but to what extent is all of that true? That's probably what I'd do my EPQ on if I were to do it again and if it were to be done on football and economics.