<p>I also find it amusing that people seem to argue about a study that they only read about in an article. Did they actually go through the details of the study ? Do they have the experience to evaluate such studies in terms of methodology, applications of statistical methods, etc. ?</p>
<p>Given how most high schools are nothing more than babysitters for parents while they are at work, I highly doubt that there is much correlation of grades to earnings. (BTW, the article doesn’t even deal with the period of highest earnings for adults.)</p>