Migration, social mobility, and social change are questions that have aroused animated international research debate during recent years. Throughout this discussion, migration often is found to be the triggering mechanism for upward social mobility and social change in the life cycle of individuals. The connection between long-distance migration and social progress in an expanding labor market is thus an important one. In American investigations, a significant amount of social mobility, both upward and downward, has been registered between roughly defined strata in the society. With a corresponding social structure in three Swedish cities investigated in the so-called “Three City Study,” almost the same results are evident.