Twin births are often construed as a natural experiment in the social and natural sciences on the premise that the occurrence of twins is quasi-random. We present new population-level evidence that challenges this premise. Using individual data for more than 18 million births (more than 500,000...

Twin births are often construed as a natural experiment in the social and natural sciences on the premise that their occurrence is quasi-random. We present new population-level evidence challenging this premise. Using data on about 18 million births in 72 countries, we find that maternal...

Twin births are often used to instrument fertility to address (negative) selection of women into fertility. However recent work shows positive selection of women into twin birth. Thus, while OLS estimates will tend to be downward biased, twin-IV estimates will tend to be upward biased. This is...

Wir untersuchen die Spillover-Effekte von Maßnahmen zur Durchsetzung der Einwanderungsbestimmungen auf das Humankapital von Kindern. Unter Nutzung der zeitlichen und geografischen Unterschiede bei der Einführung von Einwanderungsmaßnahmen stellen wir fest, dass die Englischkenntnisse von in...

We study the spillover effects of immigration enforcement policies on children's human capital. Exploiting the temporal and geographic variation in the enactment of immigration enforcement policies, we find that the English language skills of US-born children with at least one undocumented...

This paper investigates the role of self-productivity and home resources in capability formation from infancy to adolescence. In addition, we study the complementarities between basic cognitive, motor and noncognitive abilities and social as well as academic achievement. Our data are taken from...

Nirgends sonst im ökonomischen Handeln fallen Kosten und Nutzen im Zeitablauf und aufgeteilt nach Investoren und Nutznießern so eklatant auseinander wie bei Bildungsinvestitionen. In dem vorliegenden Beitrag wird argumentiert, dass in der sozialen Realität die Bildungsungleichheit im...

This paper examines the long run education and labor market effects from early-life exposure to the Greek 1941-42 famine. Given the short duration of the famine, we can separately identify the famine effects for cohorts exposed in utero, during infancy and at one year of age. We find that...

We use newly available data from Germany to study the relationship between parental income and child health. We find a strong gradient between parental income and subjective child health as has been documented earlier in the US, Canada and the UK. The relationship in Germany is about as strong...