The club's jersey featuring Mbappe's new number 10 has sold a record 345,000 units in the first 48 hours.
This is a new record, surpassing sales of previous jerseys, including those worn by Mbappe himself and Cristiano Ronaldo.
The success of the new jersey is not just a boost for Mbappe, but also for Real Madrid and the Adidas brand, which produces the team's kits.
The choice of numbers in football can have a significant economic impact, as seen in this case.