I've seen mentioned a few times, that United's 4th all time highest money recieved for a player was Dan James...
So I popped over to transfermarkt (so pinch of salt with the figures/exchange rates)....and compared City vs United:
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So.. not much in it, at 1st glance.
Ronaldo - the exception.
But if you look at the seasons of these transfers you see something more.
In the last 5 years, united have sold 4 players that make their top 19. Lukaku E74m (how?) in 19/20, James E29m in 21/22 (how??), Blind E16m 18/19 and Smalling E15m 20/21.
You then look at City and the top 6 are all in the past 5 years, and there's another 5 in the top 19.
Going back past the last 10 years, united have 9, City 5 (with SWP being the standout for us)
You can see why the spending power of the 2 clubs has gone in diametrically different ways - along with boost of City's success on the field (with it's TV money, and trophies etc) - united don't seem to get any sell-on value from their squad in recent times.
Maybe to paraphrase Ferguson, 'There's no value in the United selling market'