This article is missing important info:<p>(1) This is much less interesting if the effect doesn&#x27;t propogate, i.e. if income levels only lasts one generation. This is a <i>crucial</i> part of eugenics -- which the articles compares the effect to -- and yet nothing in the article suggests that income transfers generations. (I&#x27;m not saying it does or doesn&#x27;t; just that the article doesn&#x27;t address this at all.)<p>(2) The same is probably true for good looks, culture, athletic ability, hobbies, education, geography, race, IQ, and wealth. I suspect there are a number of confounding variables. Omitting any mention of them doesn&#x27;t invalidate the reported results, but does make misinterpreting the results of the article much easier.