Barcelona's signing of Ousmane Dembele is the second big gap between a players' actual worth and how much they cost, according to a study by the CIES football observatory.
The study compares the prices paid for players in this summer's transfer window with their current value in the market. It takes into consideration various factors: age, performances, the club they play for, their position on the pitch, their contract etc.
With that in mind, Dembele is given a value of 95.8 million euros, but Barça paid 105 million for him, with 40 million more potentially due in add-ons. The CIES put his price at 147 million, 51.2 million more than they estimate he's worth.
However, top spot is taken by Kylian Mbappe, who left Monaco for Paris Saint-Germain initially on loan but in a deal which next summer will be worth 180 million. According to CIES, he has an estimated worth of 92.6 million (a difference of 87.4 million), which is less than Dembele, curiously.
Third Benjamin Mendy, who joined Manchester City from Monaco: the player's estimated value is 28.5 million and the English club paid 57.5 million (29 million difference).