g positively correlates with conventional measures of success (academic achievement, job performance, career prestige) and negatively correlates with various social issues (school dropout, unplanned childbearing, poverty). IQ tests that measure a wide range of abilities do not predict much better than g. Scientific publishing's of findings of differences in g between ethnic groups have sparked public controversy.
Chris Brand, self-described "race realist" and author of The g Factor: General Intelligence and Its Implications discusses "the best established racial difference in g- that black people score markedly lower than whites." He adds, "The g factor is a reality discovered by science; yet egalitarian envy of excellence has meant that the discovery has yet to be harnessed to the advantage of all."