Remarkable insight reported here by Reuters...

"PARIS (Reuters) - Funds with more money under management charge
lower fees than those with only a small amount of assets because
of economies of size, says research group Fitzrovia, a Lipper
company."

I'm sure there's more to the story than the headline, but based on the précis given it sounds like a misuse of statistics to me. It would be surprising indeed if a larger fund (of comparable nature) did not have lower percentage (of AUM) fees, given not all of the costs are going to be variable.