De X-Crise (1931-1939) à X-Sursaut (2005- ?) : L'apport des Polytechniciens à la réflexion sur le rôle de l'Etat dans la vie économique

The paper tackles with the contributions on the nature and outlines of the social State in France of two associations of polytechniciens (graduates from the French Ecole polytechnique), X-Crise (constituted in the thirties) and X-Sursaut (which is contemporary to us). The paper shows that their approach, of course marked by epochs in which it manifests itself, has a syncretic and pragmatic character. Next, the paper tries to assess the capacities of innovation of X-Sursaut in its conception of social matters.