However, their key assumption was no nonmarital fertility.
Reginald D. Smith 2019, 'Marital fertility patterns and nonmarital birth ratios: an integrated approach', Genushttp://link.springer.com/article/10.1186/s41118-019-0056-z. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Another reason may be its uncoupling from nonmarital childbearing.
Anne Martin, Jeanne Brooks-Gunn 2015, 'Has Adolescent Childbearing Been Eclipsed by Nonmarital Childbearing?', Societieshttp://www.mdpi.com/2075-4698/5/4/734. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Could we combat poverty by reducing the number of unintended and nonmarital births?
Lawrence L. Wu, Nicholas D. E. Mark 2018, 'Could We Level the Playing Field? Long-Acting Reversible Contraceptives, NonmaritalFertility, and Poverty in the United States', RSF: The Russell Sage Foundation Journal of the Social Scienceshttps://www.rsfjournal.org/doi/full/10.7758/RSF.2018.4.3.08. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Partnership arrangements have become more diverse and the share of cohabiting couples and nonmarital births has been increasing.
Andreas Klärner, André Knabe 2017, 'On the normative foundations of marriage and cohabitation: Results from group discussionsin eastern and western Germany', Demographic Researchhttps://www.demographic-research.org/volumes/vol36/53/. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)