Comment Re:What is Harvard good for? (Score 1) 363
A better example of it a society can function with a low average IQ score is the US.
IQ increases by roughly 3 IQ points per decade, and the tests are periodically renormalized so that the "average" IQ is 100.
In 1932, the average IQ in the US is estimated as being less than 80 if we were using the modern scale.
Why IQ has increased over time is up for debate. It may be a healthier population, it may be a more stimulating environment, or it may just be that more people are familiar with taking tests. IMO, it's probably a mix of all these factors.
The gains do seem highest for the low end - there's not been a drastic increase by those with high IQ scores, but there's been a large increase on those on the lower end of the scale.
Similar effects have been observed in other nations, like Denmark and Japan.