The diploma thesis deals with the issue of immigration and its impact on the economy in Australia, Great Britain and the United States of America. In the introduction, various migration theories explaining the migration motifs and immigration policies, whose specifics and the type of requirements of the monitored countries sheds the composition of incoming individuals, are discussed. This profile is complemented by the analysis itself, which examines the socio-economic factors of foreign-born population living in the monitored countries. This analysis is carried out by cross-sectional data comparisons, but it monitors the arrival times of individuals, providing an overview within the timeline. In order to determine the impact of immigration on employment and average wages, regression was used, but this effect was in no way proven beyond the impact on average wages in Australia.

Introduction Research show that both educational attainment and genetic propensity to education (PGSEdu) can be associated with geographic mobility and that individuals living in more deprived areas tend to have poorer health while those living in more advantaged places tend to have better health. In this thesis, the aim was to study how polygenic scores for education and attained education influence and differ by geographic mobility, and how they influence the association between geographic mobility and mortality. Methods Data was retrieved from the Swedish Twin Registry with twins born 1926-1955 (n=14,211). Logistic regression models were performed to test if PGSEdu and attained education predicted geographic mobility. Cox regression models were then performed to test if geographic mobility, attained education or PGSEdu decreased the risk of mortality. Results The results show that both the PGSEdu and attained education predicted geographic mobility, in both independent and joint models, with higher education indicating a higher mobility. Geographic mobility decreased the risk of mortality in the independent model, but joint models showed that the association was completely explained by attained education.  Conclusions To conclude, both PGSEdu and attained education influenced geographic mobility. Moreover, attained education explained the relationship between geographic mobility and mortality.