The following is way more speculative and wacky than the proven benefits of family planning that you point out above, but I think it’s interesting that there is some evidence that changing family norms around marriage / children / etc might have large downstream effects on culture, in a way that potentially suggests “discouraging cousin marriage” as an intervention to increase openness / individualism / societal-level trust: https://forum.effectivealtruism.org/posts/h8iqvzGQJ9HiRTRja/new-cause-radio-ads-against-cousin-marriage-in-lmic
The following is way more speculative and wacky than the proven benefits of family planning that you point out above, but I think it’s interesting that there is some evidence that changing family norms around marriage / children / etc might have large downstream effects on culture, in a way that potentially suggests “discouraging cousin marriage” as an intervention to increase openness / individualism / societal-level trust: https://forum.effectivealtruism.org/posts/h8iqvzGQJ9HiRTRja/new-cause-radio-ads-against-cousin-marriage-in-lmic
Thanks, that proposal is indeed very interesting!