The economic benefits of signing Messi may be very obvious. Messi's No.30 jersey now looks like the gunners' goods, but young players like Mbappé are the most crucial thing for the future development of Greater Paris. Messi can give barley fighting power, but if there are no good young players in Greater Paris in the future, I am afraid that the dominance of the team will also be seriously reduced. Great Paris has plenty of money, but there are not so many good players in football nowadays.
The influence of Greater Paris is still not as good as that of an old-fashioned giant like Real Madrid. No matter how many French titles you win, you may not win a Champions League trophy. I don't know when Dali will complete the transformation from a local tyrant to a real giant.