Given the manner in which transfer fees have skyrocketed in recent years, it is almost impossible to put a valuation on Ross Barkley.
Here is a talent that is already illuminating the Premier League stage, but one that should get even better in the years to come.
How do you put a price on potential?
Some of the figures being discussed in the January transfer window suggest that a bid of around £45 million would be enough to prise the England international away from Everton.
Is that too much for a 21-year-old? Is it not enough for a player being tipped to become a global star?
Roberto Martinez is reluctant to be drawn into the debate, with the Toffees adamant that no discussion is required as Barkley is not for sale.
Martinez said: “You can imagine that all of our best performers, even if they get a lot of attraction from the outside and a lot of compliments, there’s not going to be anything going in January.
“Valuations? We will always be biased. I always enjoy watching Ross, the way he develops on a daily basis and performs. He’s one of those players who is someone with a real passion for the game, that enjoys playing football and you would always pay a good entrance fee to watch a player like Ross Barkley enjoying his football.
“Now we are in a situation as a team where we need to focus on the next result and the next performance. All individual performances are vital towards performing well as a side.”
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Martinez has been around long enough to know that his comments will be falling on deaf ears.
He can rule out a transfer until he is blue in the face, but the gossip while continue to swirl wildly around Goodison Park.
Manchester City are reported to be readying a big-money approach for Barkley and should they table an enticing offer, it will be interesting to see whether Everton can maintain their stance.