The French government will be bankrupt in the next couple of years. Over the last 100 years, France went from one of the richest countries in the world to somewhere with a median (not mean) GDP that is considerably lower than Mississippi's. Probably not the example you think it is.
That being said, if nobody has a job, nobody can afford the stuff being sold then everything collapses. Acting like that isn't true isn't rational either.
> The French government will be bankrupt in the next couple of years.
Their finances aren't in great shape, but if you think the ECB will let that happen, I have a bridge to sell you. (And the need for a bailout is far from a foregone conclusion.)
> a median (not mean) GDP
That's not a measure anyone uses for anything, so not sure how that's relevant.
But sure, let's go with the idea that Mississippi is "better off" on this metric. GDP per capita (which is a mean, not a median) is not a good proxy for standard of living. A French person working 35 hours per week living modestly might be much happier with less money than someone from Mississippi working 3 jobs, 6 or 7 days a week, for a total of 60 hours, who doesn't really have the time for "living" at all, modestly or otherwise.
(I'm being generous to you when I say "might be" there. What I really mean is "almost certainly is".)