Much of today’s software relies on programming code shared openly online. Yet, it is unclear why volunteer developers contribute to open-source software (OSS), a public good. We study OSS contributions of some 22,900 developers worldwide on the largest online code repository platform, GitHub,...

We conducted a randomised controlled trial (RCT) on a sample of 1,000 female garment workers in three factories in Bangladesh, off ering access to free sanitary pads at work to 500 of the workers. We cross-randomised participation in information sessions for hygienic menstrual health care...

We experimentally analyze leading by example in a public goods game with two permanent and two temporary group members. Our results show that leadership when permanent and temporary members interact leads to lower contributions than interaction without leadership.

Does a high regional concentration of immigrants of the same ethnicity affect immigrant children's acquisition of host-country language skills and educational attainment? We exploit the exogenous placement of guest workers from five ethnicities across German regions during the 1960s and 1970s in...

In recent debates on "race" and "racism", a broad definition has emerged that encompasses phenotypic appearance as well as ethnicity and religion. In addition, the "intersectional" interactions between these different characteristics are a core element of this holistic concept of racism. On the...

Multiculturalism has taken a life of its own, swinging too far in one direction. The authors claim that the rapidly changing reality calls for a new majority-minority theory and argue that the moral justifications for cultural minority rights should also apply to majority groups. They present...

Randomized experiments are often viewed as the "gold standard" of scientific evidence but people's scepticism towards experiments has compromised their viability in the past. We study preferences for experimental policy evaluations in a representative survey in Germany (N1,900). We find that a...

Over the last two decades there has been a growing debate on the supposedly negative relation between ethnic diversity, public goods production and social cohesion. Despite the amount of evidence, existing in-depth qualitative reviews conclude that the literature is inconclusive. Advancing upon...