Dysgenic fertility. People really are getting dumber over the years

Sometimes you get to read something and just have to go what the heck? Did I read that right?

Dysgenic fertility means that there is a negative correlation between intelligence and number of children. Its presence during the last century has been demonstrated in several countries. We show here that there is dysgenic fertility in the world population quantified by a correlation of − 0.73 between IQ and fertility across nations.

from The decline of the world’s IQ (Richard Lynn, John Harvey 2007)

What this paper is saying is that since about 1950 humanity is slowly getting more stupid because people who have loads of kids turn out not to be the sharpest tools in the box, on average.

You’re not usually allowed to even think that in polite society, never mind write it down in a scientific publication. It seems that the premise of the movie Idiocracy is correct. Warren Buffett needs to steady on talking about his much-vaunted human ingenuity. Looks like there’s going to be a lot less of that to go around in the years to come 😉


The problem is gathering momentum too

It is estimated that the effect of this has been a decline in the world’s genotypic IQ of 0.86 IQ points for the years 1950–2000. A further decline of 1.28 IQ points in the world’s genotypic IQ is projected for the years 2000–2050.