New York Times:
Why Six Months Seems to Be the Sweet Spot for Paid Parental Leave
25 January 2019
Barbara Petrongolo
at Queen Mary University of London found little evidence that extended leaves had a positive effect on women's employment or earnings - but found that subsidized child care and preschool did. "You want to make it easier for mothers to work, and when you talk about paid leave in isolation, the issue is who is going to take care of the baby after, and how much does it cost?" Ms. Olivetti said.