CHEERS erupted from Calais to Cannes when Kylian Mbappé, a 19-year-old striker, thumped in France’s fourth goal in the World Cup final on July 15th. Among the smuggest onlookers were the accountants at Paris Saint-Germain, Mr Mbappé’s club. He was already a prized asset before the tournament, having broken the record for goals scored by a teenager in the Champions League, Europe’s premier-club competition. CIES Football Observatory, a research organisation, reckoned then that his club could charge €190m ($223m) for him. But an electrifying World Cup, with four goals, has surely increased his value.

That, at least, is how the transfer market usually responds to international tournaments. According to 21st Club, a consultancy, each time a player found the net in the World Cup and European Championship tournaments in 2004-16, his price went up by, on average, 13%. After the 2014 World Cup James Rodríguez, whose six goals for Colombia made him the top scorer, earned a reported €80m move to Real Madrid. That was twice what 21st Club estimated he was worth from his career record.

The club soon realised it had overpaid. Mr Rodríguez struggled, and ended up loaned to Bayern Munich. Indeed 21st Club has found that though a footballer’s goals for his club in the previous season predict his future impact, those at an international tournament do not. That should not be surprising. A World Cup lasts five weeks and features plenty of mismatched teams; a domestic season is eight months of tough games. Mr Mbappé’s four World Cup goals are a less useful indicator than the 47 he scored in his two most recent club seasons.

Could Mr Mbappé net a spectacular transfer? He says he is not thinking of moving and earlier this month Real Madrid denied rumours that it had made a bid. Even so, speculation continues. Bookmakers give the club about a one-in-four chance of luring Mr Mbappé from Paris. Otherwise, the transfer market seems flat. Russia’s Aleksandr Golovin is the only surprise World Cup star close to moving—and his rumoured transfer to Chelsea may owe more to the patriotism of Roman Abramovich, the club’s Russian owner, than to its scouting department.