Situation was quite different from what it is today.
Only for the luxury market (based on my own research during my university time + when I worked in a French auction house):
France had been the number 1 (all segments included) for the luxury/Art world since the mid 17th century (Louis XIV) until the 1950s. Of course some other countries excelled in some sectors (Italy for Sculpture, Painting & Music), but France could really be considered as a giant (shared the Empire title with UK anyway, and to some extent with Spain although Spain was already on the down path).
Just an example: the auction house of Antoine Ader (Paris) was generating revenues higher than those of Christie's or Sothebys in the 1950s. 50 years later, cumulating the revenues of all 400 auction houses in France could hardly reach those of Christie's or Sothebys.
The greatest Art collectors would come to France back in the 1950s, so that would benefit the Haute Couture, the fancy hotels & restaurants and all those luxury markets.
More globally, this wealthy period was due to construction & industry, and the services sector too for some part (which has since become the major source of wealth like in other countries).
France is going down rapidly now. What will happen to our "confettis of a past Empire" (France has territories everywhere, even 4 territories in Jerusalem although with a weird status)? For how long will France remain a permanent member of the Security Council? Should France's voice (which has more than often been independent) remain to be heard? Urgent reforms (not neoliberal ones) need to be put in place, starting from "above" (limiting the number of members of the Parliament & Senators = imagine the US with 2100 Senators & 3462 members of the Parliament?! That's what we have right now in proportion... That would be hilarious if that was not so shameful)