Money
The cost of living will very much depend on the region in which you live. In France, the difference is particularly marked between the Paris region and the other regions (the provinces). Moreover, even in the same town, prices can sometimes vary greatly from one district to another.
The structure of the retail network in France is comparable to that in other European countries: there are either small retailers in town centres offering a wide variety of products and brands at fairly high prices, or well-developed retail chains (most selling goods online) located on the outskirts, which offer lower prices for mass-market products.
Take a look at the EURES Portal to get an idea of the average of the various prices in France.