Bitte verwenden Sie diesen Link, um diese Publikation zu zitieren, oder auf sie als Internetquelle zu verweisen: https://hdl.handle.net/10419/185202 
Erscheinungsjahr: 
2018
Schriftenreihe/Nr.: 
IZA Discussion Papers No. 11742
Verlag: 
Institute of Labor Economics (IZA), Bonn
Zusammenfassung: 
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 17 million births in 72 countries, we demonstrate that indicators of mother's health and health-related behaviours are systematically positively associated with the probability of a twin birth. The estimated associations are sizeable, evident in richer and poorer countries, evident even among women who do not use IVF, and hold for numerous different measures of health. We discuss potential mechanisms, showing evidence that favours selective miscarriage. Positive selection of women into twinning implies that estimates of impacts of fertility on parental investments and on women's labour supply that use twin births to instrument fertility will tend to be downward biased. This is pertinent given the emerging consensus that these relationships are weak. Our findings also potentially challenge the external validity of studies that rely upon twin differences.
Schlagwörter: 
parental investment
fertility
miscarriage
maternal health
twins
women's labor supply
JEL: 
J12
J13
C13
D13
I12
Dokumentart: 
Working Paper

Datei(en):
Datei
Größe
698.02 kB





Publikationen in EconStor sind urheberrechtlich geschützt.