It turns out that all these family-friendly policies have an unintended impact on the gender gap, as Kay Hymowitz and many others have noted. By making it easy for women to drop out of the work force and work shorter hours, they make it harder for women to progress in their careers. Swedish men have these options too, but they don’t take them. So women don’t advance as far as men. And they are also considered less desirable by corporate employers who need people on the job 24/7.

In any event, only a small proportion of Nordic women choose to work as managers and professionals. Most choose lower-paid, highly gender-segregated work. As Alison Wolf has written in her excellent book The XX Factor, Scandinavian countries “hold the record for gender segregation because they have gone the furthest in outsourcing traditional female activities and turning unpaid home-based ‘caring’ into formal employment.”

Despite vigorous efforts to stamp out gender stereotyping, most Swedish girls would still rather be daycare workers and nurses when they grow up. And boys would rather be welders and truck drivers. And that’s not all. To the extreme chagrin of social engineers throughout Scandinavia, mothers still take the bulk of parental leave. Most men take parental leave only when a certain part of it is designated for fathers only.

Here’s an even more alarming possibility. What if people in the most developed countries are inclined to express greater gender differences, not less?