https://www.pbs.org/wgbh/third-rail/episodes/episode-7-is-marriage-dead/why-are-fewer-people-getting-married/
https://www.independent.co.uk/life-style/dating/marriage-rates-decline-reason-economically-attractive-men-jobs-income-a9098956.html
https://www.psychologytoday.com/us/blog/living-single/201908/around-the-world-marriage-is-declining-singles-are-rising