Don't think this is a fair graphic when Pep's coaching career began in 2008 (discounting Barca B), while by that time Jose's first spell at Chelsea had already come to an end.
There are too many factors that can affect this stat. Inflation, short term inflation within the market itself, quality of the directors, relationships of the club with agents, expectations from the owners, financial means of the club, ability of the club to attract players, etc. etc.
But it shouldn't be too surprising to see that Mourinho has spent a lot of money over his career and this shouldn't be interpreted as a blip of any sort. He has overseen comprehensive rebuilds with sky-high expectations in his first spell at Chelsea, at Real Madrid, his second spell at Chelsea, and at United too. That's reflected in the total number of players that Mourinho has signed. While I can't remember the last time a coach like Ancelotti who is fantastic in his own right has overseen a rebuild; his first spell at Milan perhaps? But then again they had a quality DS like Galliani, they profited off of our mistakes, and then we're comparing player values in the early 00s to player values today.
I mean, Jose's most impressive accomplishments are his UCL wins with Inter and Porto, which were hardly based on superior financial muscle alone. So I think it would be wrong to describe Mourinho as a "higher spending" coach than Pep for example, whose expenditures account for 67 vs 104 new signings, despite the fact that his coaching career is 7-8 years shorter than that of Mourinho.
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