There's still a little number of them out here in Paris.
The oldest survived anyhow, and widely specialize in high-end clothes and luxury grocery today.
Stuff like Dior, Gucci, Vuitton, Chanel and so on. Tourists love to spend their money in that kind of stuff.
These are the most historic.
Le Bon Marché, that was the earliest of all, exclusively meant for luxury goods nowadays.
Bazar de l'Hôtel de Ville, that one ain't so dedicated to luxury things. You've got pretty much anything in there, up to tools for handymen.
La Samaritaine that was renovated recently, same as Le Bon Marché.
Printemps Haussmann, kind of the same as Le Bon Marché and Samaritaine, although it's not so exclusively luxury.
Galeries Lafayette, same as Printemps Haussmann, but bigger cause the brand grew international, I believe.
Those are so old that they're like landmarks and institutions in the city. They would survive any turmoil or change.