Please use this identifier to cite or link to this item: http://hdl.handle.net/10419/185338
Authors: 
Bhalotra, Sonia R.
Clarke, Damian
Year of Publication: 
2018
Series/Report no.: 
IZA Discussion Papers 11878
Abstract: 
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 pertinent given the emerging consensus that fertility has limited impacts on women's labour supply, or on investments in children. Using data for developing countries and the United States, we demonstrate the nature and size of the bias in the twin-IV estimator of the quantity-quality trade-off and estimate bounds on the true parameter.
Subjects: 
twins
fertility
maternal health
quantity-quality trade-off
parental investment
bounds
IV
JEL: 
J12
J13
C13
D13
I12
Document Type: 
Working Paper

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