Why can one club spend £100m on a striker while another gets points deducted for overspending? Every major league in Europe has its own financial rules, and they are very different from each other.

In this video we break down how the money rules work in the Premier League, La Liga, Serie A, the Bundesliga and Ligue 1, in plain English.

In this video:
Premier League: why PSR is being scrapped, and how the new Squad Cost Ratio changes what clubs can spend
La Liga: the squad cost limit, and why Barcelona have struggled to register new signings
Serie A: how Italy is tightening control of wages and transfer spending
Bundesliga: the 50+1 rule and why German clubs are run so differently
Ligue 1: the DNCG, the French financial watchdog that can block transfers and even relegate clubs
And how UEFA's own rules sit on top of all five leagues

Which league has the fairest system? Let us know in the comments