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Not a bad article, especially given that the author is from the Cato Institute, libertarian think tank formerly known as the Charles Koch Foundation. The Koch brothers tried to become majority shareholders in the early 1990s but were unsuccessful. https://twitter.com/DrGuiton/status/1324451803858046976
It cites interesting recent research from the journal of the American Psychological Society, that intelligence is more or less heritable by SES. Rich kids have plentiful resources, so genes are more important. Poor kids don't, so the variation in environment matters more.
It also points out that intelligence is what is culturally useful, or I would say culturally valued. In other places or times, "intelligent" people might not be book smart, but good leaders or practical problem-solvers.
I'm good at those kinds of tests, so school was easy for me and I became a tenured professor. But being nearsighted with a long attention span in prehistoric times, I probably would have been eaten by a dinosaur...
I have to disagree that there is a g factor or general level of intelligence, because its proponent was Spearman who was a eugenicist and selected subtests that correlated with each other. This means we may overlook other aspects of intelligence that remain untested!
Howard Gardner has a well-known theory of multiple intelligences that seems more useful in terms of educating the whole child. However, we lack the will to conduct testing of all of these types of intelligence. Tests exist for musical ability but nobody cares.
