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It's so sad that even a big team like Barcelona can't even afford to sign Nico Williams, how about Mbappe? it's impossible for them to sign Mbappe, they might only able to buy Mbappe's hair lol.

Yes, this is very sad, I must say, I also think that something is broken.
The problem is also the investments made with Xavi which have not returned and consequently the team is in a greater crisis.
Certainly the salaries and costs of the players influence the crisis of modern teams.
Poor management does further damage. In my opinion..
That’s something I think should be looked into by Uefa at some point, the salary and cost of a player although, this has been some worth regulated in the amount a team can spend in the transfers but, over again, you find teams seeking loopholes and cutting corners to archive their goal of getting what player and under certain conditions.
Not like situations in the society have helped much but, the cost of a player could be capped as, every transfer season, it often seems like teams are in the rush to hype the cost of a player who only turns out to deliver on few occasions.
In my opinion, player costs do not reflect reality. A player from the English league is sold for over 100 million Euros just because he plays slightly above average, and it is a great nonsense to pay such astronomical prices. Such high amounts should not be paid. Some teams can rise above other teams by paying this, but the spirit of football is now left behind. Unfortunately, it is a time when money is power in football.