The 2D:4D digit ratio, the ratio of the length of the 2nd digit to the length of the 4th digit, is often considered a proxy for testosterone exposure in utero. A recent study by Nicolaou et al. (2018) reported an association between the lefthand 2D:4D and self-employment (in a sample of about...

Die Bildungs- und Erwerbsverläufe von Migrantenkindern in Frankreich und Deutschland sind äußerst vielfältig. In der öffentlichen Wahrnehmung dominieren die wenig Erfolgreichen. Dabei sind erfolgreiche Biographien junger Erwachsener mit Migrationshintergrund aber keineswegs eine zu...

The educational and employment trajectories of migrant children in France and Germany are extremely diverse. The few successful ones dominate the public eye. Yet successful biographies of young adults with a migration background are in no way a negligible exception. However, the picture is...

We exploit rules of class formation to identify the causal effect of increasing the number of immigrants in a classroom on natives test scores, keeping class size constant (Pure Composition Effect). We explain why this is a relevant policy parameter although it has been neglected so far. We show...

We exploit rules of class formation to identify the causal effect of increasing the number of immigrants in a classroom on natives test scores, keeping class size constant (Pure Composition Effect). We explain why this is a relevant policy parameter although it has been neglected so far. We show...

The Prisoner Dilemma is a typical structure of interaction in human societies. In spite of a long tradition dealing with the matter from different perspectives, the emergence of cooperation or defection still remains a controversial argument from both empirical and theoretical point of views. In...

This paper employs a weighted network analysis to study the empirical properties of the world trade web and their evolution over time. We show that most countries are characterized by weak trade links; yet, there exists a group of countries featuring a large number of strong relationships, thus...