on gravity modeling and estimation for international trade and migration and on domestic firm-level labor market effects … of internationalization. Chapter 2 structurally estimates a micro-founded gravity equation for migration flows. For a … migration frictions. Chapter 3 asks how the welfare quantification of trade liberalization changes if one allows workers to be …

- to eleven-year old primary school children in the city of Meran, we find that cooperation generally increases with age …, but that the gap between cooperation among in-group members and cooperation towards children speaking another language is …