WHICH PLAYERS ARE THE MOST VALUABLE IN WORLD SOCCER?

The Football Website "Transfermarket", specialized in calculating the Market Value of World Football Players, has released their current "Top 25 Valuable Football Players" list. The criteria used for evaluating the current Economic Market Value of each Player is - for me - not clear, as the example of Atletico de Madrid player Antonnie Griezmann who is estimated 100M�. This is his contract