RT Journal Article SR Electronic T1 Motherhood and Female Labor Supply in the Developing World JF Journal of Human Resources JO J Hum Resour FD University of Wisconsin Press SP 800 OP 826 DO 10.3368/jhr.46.4.800 VO 46 IS 4 A1 Agüero, Jorge M. A1 Marks, Mindy S. YR 2011 UL http://jhr.uwpress.org/content/46/4/800.abstract AB We introduce a new instrument for family size, infertility, to investigate the causal relationship between children and female labor force participation. Infertility mimics an experiment where nature assigns an upper bound for family size, independent of a woman’s background. This new instrument allows us to investigate the differential labor supply without restrictions on initial family size. Using the Demographic and Health Surveys from 26 developing countries we show that OLS estimates are biased upward. We find that the presence of children affects neither the likelihood of work nor its intensity, but impacts the type of work a woman pursues.