Another month, another rationality quotes thread. The rules are:
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Why would we have to assume that IQ is a good measure of intelligence across different sub-cultures? Aren't there experiments we could perform to measure the validity?
It seems like a core assumption of the "intellectual" realists. I'm conceding it to strong-man the opposing argument. If we don't assume IQ is culturally independent, the correlation between IQ and life outcome looks like a hidden-variable measure of social acceptability - i.e. an expected status quo bias if people prefer those they perceive as in-group. That just weakens the realist argument.