Yeah, I was sort of leading the witness with those questions, because what you've said is undeniably true, and anyone with a brain can pretty easily come to that conclusion. Especially in our business, is the Naval Academy or Princeton grad any more capable than the Ohio State or Texas A&M grad (though the A&M grad will certainly be the most obnoxious about his alma mater)? Of course not. They're all 2ndLts who have to figure it out the hard way. There's no standardized testing as a platoon commander for which you can study all night and day and get a 100%. But when it comes time to transition (careers, not genders) the former have an undeniable advantage, probably due to either the prestige/shock factor or alumni network, or a combination of the two.
I've known Community College grads who I would pick to be on my team every day of the week, and Harvard grads who were so infatuated with their own intelligence that they didn't even care to know their Marines' names. And vice versa. Not to mention degree program. In no universe is chemical engineering at the University of Georgia easier or less meaningful than a Philosophy degree from Yale (obviously). But I'd be interested to see a study comparing like-degree programs from a state school and a top 10 Ivy. I'm not sure what they would "measure" in terms of actual career field effectiveness, but I'm sure it could be done. Or even just interviews with Fortune 500 CEOs to see if the recruiting factors actually translate over to success factors once those individuals are hired.
Disclaimer: I barely passed state college so if you're thinking I'm just a dumb, bitter, liberal-arts-degree holder that just needed a piece of paper in order to commission, you're probably not ENTIRELY wrong.
As a group, I think that Academy grads have a definitive and measurable advantage over both their ROTC and OCS counterparts through the company-grade ranks. About the time they become senior captains most of that has evaporated. But Academy grads are grossly over-represented in terms of commissioning numbers at the highest grades, so if you want to make a career out of it as an officer, it might pay to go the Academy route.
When it comes to the study you inquired about, this one isn't a direct match but it's pretty telling:
The median annual earnings for an Ivy League graduate 10 years after starting amount to well over $70,000 a year. For graduates of all other schools, the median is around $34,000. But things get really interesting at the top end of the income spectrum. The top 10 percent of Ivy League grads are earning $200,000 or more ten years after starting school. The top earners of other schools, on the other hand, are making just a hair under $70,000.
It might be hard to tell if this is causation (i.e. going to one of these schools is what made these people earn so much more than their peers) or it might be simple correlation (these folks were going to be rock stars regardless and would have been making that high-end $$$ regardless of where they went to school). I fall on the "causation" side.
I have a degree from a military junior college and one from one of the schools mentioned in the report, and as a broad categorization, if I had to pick between the two I'd rather have a team picked from the high-end school than the low-end, open-admission one. Of course I'd rather cherry pick the best from both...
Not everyone who graduates from any school... Ranger School, BUD/S, the police academy, UPENN, whatever, is going to be a special person. But it does seem to make it more likely.