I think Mourinho made the best point on the Neymar deal.
It is not too much the case that Neymar is overpriced, he is in the next bracket of top players after Messi and Ronaldo.
But this will now over-inflate prices elsewhere, where you will now start seeing £50-60m player become the absolute norm.
You can see it already with Swansea wanting 50m+ for Sigurdson, yes a good player but realistically only a 15-20m player.
It seems now that Man Utd would of got an absolute bargain if they only paid £80m for Griezmann.
I know why Neymar did the transfer he needed to not be the 3rd best attacker in a front 3, but the main focal point of a team and try to get that team to win the Champions League, which I believe at some point in the next 5 years PSG eventually will.
His aim is to also win the Ballon d'Or, which he does have a semi decent chance of doing once Messi and Ronaldo retires, but he will be 28-30 by that time and there might be a new kid on the block like Mbappe by that time who has overtaken Neymar.
But sooner or later the transfer market surely has to crash, and valuations return to near normal, because if PSG don't get in trouble with Financial Fair Play over this, then it means the system doesn't work, as clubs are bigger than UEFA.