Wealth is a difficult confounding factor to remove. The wealthier you are, the faster you will become even wealthier, on average; in other words, the faster you

Wealth is a difficult confounding factor to remove. The wealthier you are, the faster you will become even wealthier, on average; in other words, the faster your social mobility. Even if genetics played a role in the initial accumulation of family wealth, that effect would be quickly eclipsed by the wealth-generating power of capital itself.