[Forlien]

IQ might be a better predictor, but the linked paper says it's not a far better one:

"The results demonstrate that intelligence is a powerful predictor of success but, on the whole, not an overwhelmingly better predictor than parental SES or grades."

[ericd]

That might just mean that intelligence is useful not only for gaining personal success, but also for raising offspring who will be successful. Is that a problem that society should try to correct?