Effets d'une immigration dans quelques populations modèles

Tabah Léon and Cataldi Alberto. ? Results of an Immigration into a Few Model Populations. Among the wide number of problems of all kinds raised by population migrations, one ought to be studied by priority : the study of merely demographic results of migrations. Changes in the spatial distribution of a population lead necessarily to demographic consequences : marriages have been delayed, couples are separated, their fertility is reduced, modifications occur in age distribution as the age structure of the migrants' flow always differs of the age structure of the population the migrants have left behind or where they are going to. Still, such problems are not very well known, either because a very large number of factors are to be taken into account in such a phenomenon, or because observation itself is made difficult, as necessarily, it is ex-post facto. Hence the idea of contriving a simplified situation where only a few factors are retained and of examining which are the consequences of the observed phenomenon in such a théorie but perfectly well known conception. The model method applied here is more and more widely used in sociological sciences. This work has been carried through at the Latino-American Demographic Center in Santiago, Chile, by Mr. Léon Tabah, United Nations Expert, and by Mr. Alberto Cataldi, who was given a grant for this Center by the United-Nations, and who is presently a United-Nations Expert in Peru.