The theme of "fluidity of the elite" has a sociological tradition, too. According to Dominique Merllié, Vilfredo Pareto (1848-1923), who divided society into two classes, the elite and the rest, affirmed that the destiny of elites is to renew themselves, either progressively by integrating some new individuals and rejecting others, or globally when a group, due to a failure to renew itself or for other grounds, loses its dominant position. [22] In addition, the notion of social mobility itself, introduced by Pitirim Sorokin (1889-1968), was formulated on the basis of the problem of elites. For Sorokin, social mobility appeared to be a form of generalization of the older theme of "the mobility of elites". And still long after Sorokin, works on social mobility are in fact fairly often limited to the question of elite recruitment.[23] This tradition returns to an ancient preoccupation in the developed Western societies, that of equality, at least formal, of opportunity. Without being egalitarian societies, North America and old Europe are meritocratic societies, where it is demonstrated and made evident that the dominant positions are not only inherited, but are earned and that they are the object of a valiant struggle whose result is uncertain.
To counter this socially and politically legitimizing picture of an open society, in which competition is possible and permits each person to realize his opportunities, it is necessary to recall some elementary facts. First of all, that "immobility prevails over mobility" as the tables of social mobility show.[24] And then, that social replication does not handle the individual case, from father to son or mother to daughter. This reproduction gains significance on a group scale. It is even more true for the haute bourgeoisie that