Mbappé's wage demands are going to be so large due to his profile. He's had 4 years now of being branded as the next big thing, he's played an important role in a world cup win, he plays for PSG, he's got big links with Nike and Air Jordan through PSG. Basically he's extremely marketable already and he's only going to increase on that front, and with his age that's going to last a loooooong time. So he can demand huge wages.City have decided a move against Mbappé due to his wages apparently according to Athletic.
Lets hope Haaland's wage demands are good enough for City.
Right now Haaland's major appeal is solely on the pitch stuff. That may change but he's not in the position to ask for what Mbappé would. He might ask for a big amount but I don't think it'd be beyond anything City would offer.