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α: calibrated so average coauthorship-adjusted count equals average raw count
Evidence suggests that separate spheres gender norms discourage girls from maths. We therefore examine a policy that counteracts such norms among parents, and investigate whether it increases girls' participation in maths‐intensive studies. Specifically, we examine a parental leave reform that reserved one month of leave for fathers, and estimate its effect on children's study choices. We find that the reform increases the probability of doing a maths‐intensive programme in upper secondary education among girls whose father was otherwise reluctant to take leave. There is no effect on boys. We also conduct heterogeneity analyses to investigate whether the results can be explained by human capital transmission or the gender norms mechanism. The results of our analyses suggest that the gender norms mechanism is at play.