Via the blog Freakonomics, which writes about "The hidden side of everything":
Just how important is Mom during a child’s first year of life? A new working paper by the economists Pedro Carneiro, Katrine V. Løken, and Kjell G. Salvanes exploits a recent reform in Norway to answer that question. The reform, which increased paid and unpaid maternity leave, “increased maternal leave on average by 4 months,” but had no effect on family income. The authors found that more time with Mom led to lower high school dropout rates later on.
Photo: Kelly Crabtree