Where is the 6th largest French City ?

I have heard a lot of French people are leaving the country because of more favorable tax structure elsewhere, especially true of bankers, investment folks and the like.

Could you comment on that?

There are many reasons. London has been an escape from France since the 1700s.

Another reason for the current wave is :

"Others are escaping from things in France such as family problems, educational
problems and areas like Department 93, because people who live in that part of
Paris sometimes have trouble finding a job."