How much do you think you're worth over the course of your career? It's a strange question, one that many people never have to consider.
But for footballers it's pretty easy to figure out. Now, transfer fees don't necessarily reflect every player - Andres Iniesta is not worth nothing because he's never moved.
A transfer requires a certain set of conditions to be near perfect - there needs to be interest from clubs with the means to pay, there must be a willingness to sell, and the player must consent.
Still, a valuation of a player, can in a very limited sense, be used as an indication of their worth at a specific point in their career.
Because for some restless folk, the size of the transfer fee reflects their relative standing in the game - witness the back-and-forth over the Gareth Bale-Cristiano Ronaldo most expensive transfer fee debate.
Here, we count down the top ten players who can claim to call themselves the most expensive players (in cumulative transfer fees) of all-time.
There's some big names in there - both current and retired - and it's no surprise to note that all play or played in the recent mega-money era of football.
Anyway, here's your top ten...