DISCUSSION PAPER SERIES - IZA Institute of Labor Economics
DISCUSSION PAPER SERIES
IZA DP No. 15203
Does Cutting Child Benefits Reduce Fertility in Larger Families? Evidence from the UK's Two-Child Limit
Mary Reader Jonathan Portes Ruth Patrick
APRIL 2022
DISCUSSION PAPER SERIES
IZA DP No. 15203
Does Cutting Child Benefits Reduce Fertility in Larger Families? Evidence from the UK's Two-Child Limit
Mary Reader
London School of Economics and Political Science
Jonathan Portes
King's College London and IZA
Ruth Patrick
University of York
APRIL 2022
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IZA DP No. 15203
APRIL 2022
ABSTRACT
Does Cutting Child Benefits Reduce Fertility in Larger Families? Evidence from the UK's Two-Child Limit*
We study the impact of restricting child-related social assistance to the first two children in the family on the fertility of third and subsequent births. As of April 2017, all third and subsequent born children to low-income families in the UK did not receive meanstested child benefits, amounting to a reduction in income relative to the previous system of approximately 3000 GBP a year per child. We use administrative births microdata and household survey data to estimate the impact of the two-child limit on higher-order births with a triple differences approach, exploiting variation over date of birth, socio-economic status, and birth order. We find some evidence that the policy led to a small decline in higher-order fertility among lowincome families. However, compared to earlier research in the UK and elsewhere, largely based on benefit increases, the impact is small. This may be due to informational barriers or to other economic and social constraints affecting low income families. Our results imply that the main impact of cuts to child benefits is not to reduce fertility but to withdraw income from low-income families, with potential implications for child poverty.
JEL Classification: Keywords:
J13, J18, H31, H53 fertility, family size, social assistance, welfare reform
Corresponding author: Mary Reader Centre for Analysis of Social Exclusion London School of Economics and Political Science Houghton Street London, WC2A 2AE United Kingdom
E-mail: m.reader@lse.ac.uk
* We thank Mike Brewer, members of the Benefit Changes and Larger Families advisory board, CASE Researchers' Workshop attendees, and members of the Social Policy Quantitative Reading Group for helpful comments. This work was produced using statistical data from the Office for National Statistics. The use of the ONS statistical data in this work does not imply the endorsement of the ONS in relation to the interpretation or analysis of the statistical data. This work uses research datasets which may not exactly reproduce National Statistics aggregates. We acknowledge funding from the Nuffield Foundation from grant FR-23208. The Nuffield Foundation is an independent charitable trust with a mission to advance social well-being. It funds research that informs social policy, primarily in Education, Welfare, and Justice. It also funds student programmes that provide opportunities for young people to develop skills in quantitative and scientific methods. The Nuffield Foundation is the founder and co-funder of the Nuffield Council on Bioethics and the Ada Lovelace Institute. The Foundation has funded this project, but the views expressed are those of the authors and not necessarily the Foundation.
Contents
1 Introduction
5
2 Background
6
2.1 The two-child limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Existing evidence on welfare and fertility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Data
10
4 Method
12
4.1 Differential changes in the probability of low-income women having a higher-order (3+) child 13
4.1.1 Defining low income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1.2 Estimating the probability of having a child . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 Differential changes in the probability of a child being a higher-order (3+) birth to a lowincome family . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5 Results
18
5.1 Differential changes in the probability of having a child, by benefits receipt and family size . . 18
5.2 Differential changes in the probability of having a child, by occupation and family size . . . . 18
5.3 Differential changes in the probability of being a higher-order birth, by occupation and local deprivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6 Discussion
21
7 Conclusion
23
Appendix A
36
7.1 Anticipation or lagged effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7.2 Placebo cut-off tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3
List of Tables
1 Summary statistics for administrative births microdata in England and Wales, 2015-2019 . . 28 2 Annual population estimates from Annual Population Survey sample, women aged 16-45 in
England and Wales, 2015-2019 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 3 Triple difference estimates by benefits receipt and family size . . . . . . . . . . . . . . . . . . 30 4 Triple difference estimates by family occupation and family size . . . . . . . . . . . . . . . . . 31 5 Effects of the two-child limit on the probability of being a higher-order birth: triple differences
results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 6 Triple differences estimates using administrative births data, accounting for time trends . . . 35 7 Placebo cut-off test: treatment defined by low-income occupations . . . . . . . . . . . . . . . 37 8 Placebo cut-off test: treatment defined by local deprivation . . . . . . . . . . . . . . . . . . . 38 9 Placebo cut-off test: treatment defined by local two-child limit incidence . . . . . . . . . . . . 39
List of Figures
1 Number of total and 3+ births in England and Wales by year, 2013-2019 . . . . . . . . . . . 29 2 Probability of having a child by benefits receipt, family size and year, 2015-2019 . . . . . . . 30 3 Probability of having a child by NS-SEC occupation, family size and year, 2015-2019 . . . . . 31 4 Proportion of total births who are higher order (third or subsequent births), by treatment and
control group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5 Effect of parents being in low-income occupations on the probability of a baby being a higher-
order birth (i.e., third or subsequent birth), by half-year of birth . . . . . . . . . . . . . . . . 34
4
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