There is different social contract there: in Paris the "fraternite, egalite" means you cannot pay developers more than the other people around and high taxes ar

There is different social contract there: in Paris the "fraternite, egalite" means you cannot pay developers more than the other people around and high taxes are a second way to ensure this will not happen. This makes Paris a prime choice not to do development and in the end gives dramatically lower "market" rates. Don't forget that "the best of the best" more to places like Silicon Valley where they earn top dollar, the ones that chose to stay in Paris are what is left behind and a few exceptions. At least this is what it looks from an European point of view.