All regressions are based on the same 36 observations at the national level and 360 observations at the sub-national level per year and are weighted by the sample size of the education’experience’year cell. All regression models include education, experience, and period fixed effects, and a full set of two-way interactions. In this context, the educational attainment of foreign- and native-born workers is also taken into account. Thereafter, the chapter looks at factors that help explain why the contribution of foreign-born workers may be different from native-born workers based on qualitative studies of selected sectors.