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Federal Reserve Bank of St. Louis
Working Papers
Why did Rich Families Increase their Fertility? Inequality and Marketization of Child Care
Michael Bar
Moshe Hazan
Oksana Leukhina
David Weiss
Hosny Zoabi
Abstract

A negative relationship between income and fertility has persisted for so long that its existence is often taken for granted. One economic theory builds on this relationship and argues that rising inequality leads to greater differential fertility between rich and poor. We show that the relationship between income and fertility has flattened between 1980 and 2010 in the US, a time of increasing inequality, as high income families increased their fertility. These facts challenge the standard theory. We propose that marketization of parental time costs can explain the changing relationship between income and fertility. We show this result both theoretically and quantitatively, after disciplining the model on US data. We explore implications of changing differential fertility for aggregate human capital. Additionally, policies, such as the minimum wage, that affect the cost of marketization, have a negative effect on the fertility and labor supply of high income women. We end by discussing the insights of this theory to the economics of marital sorting.


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Michael Bar & Moshe Hazan & Oksana Leukhina & David Weiss & Hosny Zoabi, Why did Rich Families Increase their Fertility? Inequality and Marketization of Child Care, Federal Reserve Bank of St. Louis, Working Papers 2018-22, 25 Sep 2018.
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Keywords: Income Inequality; Marketization; Differential Fertility; Human Capital; Minimum Wage
DOI: doi.org/10.20955/wp.2018.022
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