This paper summarizes in a non-technical way what we know from empirical studies based on firm-level data about the mutual links between international activities of firms and productivity. It is written with a view to inform policy makers in an evidencebased way. A special focus is on the...

This chapter reviews and discusses major theories and empirical studies about the welfare magnet hypothesis, i.e. whether immigrants are more likely to move to countries with generous welfare systems. Although economic theory predicts that welfare generosity affects the number, composition and...