Start with the students who are already there, on paper, and never show up. Between 25,000 and 35,000 low-income American high schoolers score in the top 10% of all students nationally on the SAT or ACT and hold grades to match.[1] Among the highest-scoring seniors from the bottom quarter of the income distribution, only 34% end up enrolled at one of the country's 238 most selective colleges and universities.[1] The ones who do apply are not a marginal case study -- research following these students found they get admitted and graduate at high rates, the same as their higher-income classmates.[1]
The reason most never apply is not the number most people assume it is. Economists Caroline Hoxby and Christopher Avery, studying tens of thousands of these students directly, found that a selective college -- with its far more generous financial aid -- would often cost a high-achieving low-income student less than the non-selective two-year or four-year school they actually enroll in instead.[1] The barrier isn't the sticker price. It's earlier and less visible: these students are concentrated outside the major cities where elite-college recruiting actually focuses, most are unaware such aid exists at all, and most have never had a mentor who attended a selective university to tell them the door was actually open.[1]
Even where the door is genuinely open, the outcome still isn't close to blind. A landmark study covering more than 30 million American college students, matched to their parents' tax records, found that a child whose parents sit in the top 1% of the income distribution is 77 times more likely to attend an Ivy League college than a child whose parents sit in the bottom income quintile.[2] At the group of schools researchers call "Ivy-Plus" -- the Ivy League plus Stanford, MIT, Duke, and the University of Chicago -- more students come from families in the top 1% alone than from the entire bottom half of the American income distribution combined.[2] The same research found that low- and high-income students who attend the same college go on to earn similar incomes -- the students who make it in are not mismatched or underprepared once they arrive.[2] The gap isn't what happens after admission. It's who gets found before it.
MIT itself is a useful measure of how long "official" and "actual" can stay two different things. The school's own need-based aid dates back to 1867, only two years after classes began.[3] A formal need-blind admissions policy -- ability to pay removed entirely from the admissions decision -- didn't arrive until the 1950s, nine decades later.[3] Today MIT describes itself as need-blind and full-need, meeting 100% of every admitted student's demonstrated financial need without loans; 88% of its students graduate debt-free.[3] The policy is real. The Ivy-Plus enrollment data above is also real, measured at the same institutions, in the same years the policy was already in place. A generous aid formula and an actually representative student body turned out to be two different problems, solved on two different timelines -- and the second one still isn't solved.