"As the statistics show in the example of the Nordic countries, as a country becomes more egalitarian, this affects divorce rates, single parent households and female choice. The recycling of men into second and third groups of children with different women, something that has also become a trend in the United States where up to 28% of women have children by more than one man, in a form of reproductive mixed market, is perhaps facilitated more through the generous Nordic Welfare states. [18, 19]
A researcher states in a Jezebel article
“And Dorius herself went even further, saying that multipartner fertility isn’t just a byproduct of inequality, but an engine of it: “Juggling all the different needs and demands of fathers in at least two households, four or more pairs of grandparents, and two or more children creates a huge set of chronic stressors that families have to deal with for decades.”” "