This study does not settle the matter. First of all, the additional year of schooling has not been shown to compound, i.e. it works for 1 or 2 years, doesn't m

This study does not settle the matter. First of all, the additional year of schooling has not been shown to compound, i.e. it works for 1 or 2 years, doesn't mean it works for several years (if it doesn't, then as I had claimed, the gains are NOT very significant). Second, the highest change (5 points per year) was for the cases where "Students who made an age cutoff to begin schooling were compared with students who had not.", which seems to me to imply the difference was of only one year (students who did not make the cutoff had to wait another year to get in), while the other cases, which are what we normally think of when considering years of schooling (i.e. students who were going to get the same number of years of schooling VS the drop-outs) the increase was only 1-2 points over a few years maximum... again, not really very significant (I would consider at least 10 points to be something significant in terms of changing possible outcomes for the person). Here's where I found most of this information: https://www.psychologytoday.com/intl/blog/brainstorm/201806/how-much-does-education-really-boost-intelligence https://www.psychologytoday.com/intl/blog/brainstorm/201806/... Happy to be corrected if I misunderstand something.