David Archibald, a visiting fellow at the Institute of World Politics in Washington, D.C., is the author of Twilight of Abundance (Regnery, 2014)
Humans, we’re a strange species — not least for the peculiar inherited traits and propensities that so often seem innate as the colour of eyes and hair. Social engineers advocate legislation as the great leveller, but stubborn genes just aren’t listening.
So, if there are far more deleterious mutations than beneficial ones in each generation, how did we get a far as we did? How that happened is detailed in Gregory Clark’s “A Farewell to Alms”. Human society has traditionally been run as a meritocracy with assortative mating amongst the more productive members of society. Pre-contraception, more productive members of society had larger families than less productive people, who barely scraped by. So, while everyone suffered from the same mutational load, the effects of assortative mating could overcome that and the genetic makeup improved. The replacement fertility rate to keep population steady is considered to be 2.3 children per woman. That is purely in terms of numbers. Including the mutational load, the number might be 2.5 or higher.