In our increasingly interconnected and open world, international migration is becoming an important socioeconomic phenomenon for many countries. Since the early 1980s, many studies have been undertaken of the impact of immigration on host labour markets. Borjas (2003) noted that the estimated effect of immigration on the wage of native workers varies widely from study to study and sometimes even within the same study. In addition, these effects cluster around zero. Such a small effect is a rather surprising outcome, given that in a closed competitive labour market an increase in labour supply may be expected to exert a downward pressure on wages. We revisit this issue by applying meta-analytic techniques to a sample of eighteen papers, which altogether generated 348 estimates of the percentage change in the wage of a native worker with respect to a one percentage point increase in the ratio of immigrants over native workers. While many studies in our sample employ US data, estimates are also obtained from Germany,

Different disciplines within the social sciences have produced large theoretical and empirical literatures to explain the determinants of anti-immigration attitudes. We bring together these literatures in a unified framework and identify testable hypothesis on what characteristics of the individual and of the local environment are likely to have an impact on anti-immigration attitudes. While most of the previous literature focuses on the explanation of attitudes at the individual level, we focus on the impact on regional characteristics (the local context). Our aim is to explain why people living in different regions differ in terms of their attitudes towards immigration. We isolate the impact of regions from regressions using individual-level data and explain this residual regional heterogeneity in attitudes with aggregate level indicators of regional characteristics. We find that regions with a higher percentage of immigrants born outside the EU and a higher unemployment rate among the immigrant population show a higher probability that natives express negative attitudes to immigration. Regions with a higher unemployment rate among natives however, show less pronounced anti-immigrant attitudes.JEL Classification: F22; J15; J61; R19