Daniel Aaronson, Rajeev Dehejia, Andrew Jordan, Cristian Pop-Eleches , Cyrus Samii, Karl Schulze, 15 September 2017

Women’s fertility and labour supply decisions are made simultaneously, making it difficult to identify the effect of the former on the latter. This column explores the relationship using a dataset spanning 200 years and 103 countries, leveraging twin births to isolate causal effects. The key finding is that as countries develop, women’s labour supply becomes more responsive to additional children. The global decline in fertility over the last century has played a positive role in increasing women’s work in developed countries, but a negligible one in developing countries.

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