Value is hard to come by in football. In the current inflated market, players regularly fetch exorbitant figures.
Recently the CIES Football Observatory attempted to rank, according to economic value, the world's 60 most valuable players. That list can be seen in full here.
It's an impressive selection of players, but the various criteria used to establish the ranking fail to take into account some of football's variable factors: age, residual value and length of contract.
Over the next 20 slides we attempt to redefine the planet's 20 most valuable players.