That's a tautology, like saying the largest predictor of how many languages you will speak is if you are born into a multilingual home regardless of how well yo

That's a tautology, like saying the largest predictor of how many languages you will speak is if you are born into a multilingual home regardless of how well your language centers develop. The better metric would be correlating someone's socio-economic class at birth with deltas in wealth later in life. I'd be very surprised to find a radically different conclusion, but at the least it'll give us more actionable data. After all, trying to eradicate advantages-by-birth might be the most futile exercise in human history but maybe we can adjust for them as we grow to learn more about the statistical relationship.