SUMMARY. In this paper, fluctuations in nuptiality are studied by investigating fluctuations in the numbers of births, similar to those which have been registered in France since 1914. The model assumes random choice of partners within a given circle of relationships, which will depend on age....

SUMMARY In a previous article, published in 1971, the consequences on careers of sudden fluctuations in the recruitement were examined in the case of promotion by seniority. The same subject is studied here for promotion by choice in order to know whether this kind of promotion lessens the...