IQ is a poor predictor of, say, income, in the absolute sense. Correlation is something like 0.4. But compared to what? Compared to personal psychological metri

IQ is a poor predictor of, say, income, in the absolute sense. Correlation is something like 0.4. But compared to what? Compared to personal psychological metrics (of which IQ is one), IQ performs extremely well as a predictor. Things like openness and extraversion correlate at something like 0.1 and others are lower. In fact, IQ is the single best predictor we have and other correlations are usually measured while controlling for IQ.