Average Swedish male height in 1820 was ~167 cm. Average Swedish male height now is ~179cm. That appears to be nearly a 2stdv increase.
Similar effects hold in Portugal.
Do the anti-Flynn effect people believe that malnutrition and disease affect height MORE than they affect IQ...because musculature is a more sensitive-to-disturbance system than is the brain?
Supposing that on average, the people of 1820 were 2stdv shorter, and 2stdv (probably more) less intelligent...how does ANYONE hold the position that economic freedom is only beneficial to smart folks? The 1820s were America's boom...full of stupid people...and we were exploding economically...just like every other British (or ex-British) colony with a laissez faire government has.
For economic growth:
Economic system -- Laissez Faire + Culture of property rights matters FAR MORE than HBD/Population Factors.