You hint at this, but it's worth saying it explicitly--folks with lower IQ could out-produce folks with high IQ even without having more kids per-person, as lon

You hint at this, but it's worth saying it explicitly--folks with lower IQ could out-produce folks with high IQ even without having more kids per-person, as long as they're reproducing at a younger age. If, say, lower IQ people were to have kids at an average age of 23, and higher people have kids at an average age of 33, the lower IQ folks would have twice as many kids over a ~100 year span and 4x as many over ~150 years!