Every spring, millions of families gather around the same artifact: a ranking. Maybe it’s the famous one with a single number printed next to each school’s name, a number that compresses libraries, laboratories, faculty salaries, and centuries of reputation into a tidy ordinal. We treat that number as if it answers the question we’re actually asking. It does not.
The question most families are asking — even when they don’t say it out loud — is some version of this: If my kid goes here, what happens to their life? That is a question about trajectories, about where a person starts and where they end up. And it turns out we now have data that speaks to it directly. We can follow millions of students from the income bracket of the families they were born into to the income bracket they reach in their thirties. We can do this college by college. The results are not what the rankings would lead you to expect.
I want to walk you through what that data shows, because once you’ve seen it, it’s very hard to read a conventional college ranking the same way again.
What rankings actually measure
Start with a simple observation. The most influential college rankings reward selectivity. They reward how many students a school turns away, the test scores of the students it lets in, the size of its endowment, how much it spends per student, and how impressed other administrators are by its name.
Notice what’s missing from that list: any measure of what the institution does for the students once they arrive.
A school can rise in the rankings by admitting a smaller, wealthier, higher-scoring class — without educating anyone one bit better. In fact, the incentives run in a troubling direction. If your ranking depends on the average preparedness of your incoming students, the cleanest way to look good is to enroll students who were already going to be fine. Prestige, measured this way, is less a report card on the school than a report card on the families who can afford to send their children there.
This is the core confusion I want to clear up. Selectivity is an input. Mobility is an outcome. Rankings sell you the input and let you assume it implies the outcome. The data lets us check whether that assumption holds. Mostly, it doesn’t.
The two numbers that actually matter
When my collaborators and I built what we came to call “mobility report cards,” we tried to capture a college’s contribution to upward mobility with a deceptively simple formula. A school’s mobility rate is the product of two things:
Access — the share of a school’s students who come from low-income families (say, the bottom fifth of the national income distribution).
Success — the share of those low-income students who climb to the top of the distribution (say, the top fifth) by their mid-thirties.
Mobility rate = Access × Success.
This little equation does something the rankings never do: it insists that both halves count.
A college can have a spectacular success rate — nearly every low-income student who enrolls rockets into the top of the distribution — and still contribute almost nothing to mobility at the level of society, because it enrolls a vanishing number of low-income students in the first place. Conversely, a college can enroll an enormous share of low-income students but fail to move them anywhere, and that doesn’t help either.
The colleges that genuinely change the shape of the American income distribution are the ones that do both at once. They let large numbers of poor kids in, and they launch them. And here’s the thing — those colleges are, by and large, not the ones at the top of the prestige rankings.
The surprising leaderboard
When you sort colleges by mobility rate instead of by selectivity, an entirely different leaderboard appears.
The institutions that consistently top it are not the ones with ivy on the walls. They are mid-tier, broad-access public colleges and regional universities. Campuses in the City University of New York system. California State campuses. State schools in Texas serving heavily first-generation populations. Places that almost never crack the conversation when an anxious seventeen-year-old is drawing up a dream list.
The reason is structural, and it follows directly from the equation. These schools admit the vast majority of students who apply. Their classrooms are full of students from the bottom of the income distribution — students an elite admissions office would, statistically, rarely see. And critically, a meaningful fraction of those students go on to earn solidly middle-class and upper-middle-class incomes. High access multiplied by respectable success produces a mobility rate that buries the famous schools.
I’ll put the contrast as plainly as I can. Some of the most selective colleges in the country move only a tiny number of low-income students into the upper third of earners — not because they fail those students, but because they enroll so few of them to begin with. A regional public university you’ve possibly never heard of can move several times as many. If your metric is “engine of upward mobility,” the unglamorous campus is doing the heavy lifting.
The elite paradox
Now, I want to be careful here, because the data also contains a fact that pulls in the opposite direction, and intellectual honesty requires putting both on the table.
At the most selective private colleges — the dozen or so institutions that sit at the apex of the prestige hierarchy — the success rate is genuinely extraordinary. A low-income student who actually gets in and enrolls has remarkably good odds of reaching the very top of the income distribution. Comparing students with similar test scores and academic records, attending one of these schools meaningfully raises the probability of landing in the top 1% of earners, of attending an elite graduate program, of working at a prestigious firm. The credential opens doors that a comparable degree from a flagship state university leaves closed.
So elite colleges are not a fraud. For the individual student who gets in, they can be transformative.
The paradox is about access. At many of these same schools, there are more students from the richest 1% of families than from the entire bottom 60% combined. A handful have historically enrolled more students from the top 1% than from the bottom 60%. The escalator at these schools runs fast — but the velvet rope at the bottom is what keeps most low-income students off it. The institutions deliver enormous mobility per student admitted, and almost no mobility per student in the population, because the population they draw from is so narrow and so wealthy.
This is the elite paradox in one sentence: the schools with the highest success rates have some of the lowest access, and the schools with the highest access rarely have the highest success. The mobility champions are the ones that find a workable balance.
What this means for the choice in front of you
Here is where the data stops being an academic curiosity and starts being practical advice. Let me translate it into the actual decision a family is making.
Stop treating selectivity as a proxy for quality. A school being hard to get into tells you about the other applicants. It tells you almost nothing about how much the place will add to your trajectory. Two students with identical SAT scores can have very different outcomes depending on where they enroll — and the difference is not reliably predicted by which school has the lower admit rate.
Ask what the school does for students who start where you start. This is the single most useful reframing I can offer. The average outcome at a college blends together students from radically different starting points. If you come from a low-income family, the relevant number isn’t the school’s overall average earnings — it’s the earnings of students who arrived from a background like yours. The mobility data lets you isolate exactly that.
Weigh access and success together. If you’re a low-income student deciding between a famous school that admits very few people like you and a less famous one that admits and elevates many, recognize that both can be excellent choices — for different reasons. The elite school, if you get in, offers an exceptional success rate. The broad-access school offers a near-certain seat on a real, if less spectacular, escalator. Neither dominates; the right answer depends on your odds, your finances, and your appetite for risk.
Look at net price, not sticker price. Mobility is corroded by debt. A degree that launches you into the middle class but saddles you with payments that consume that gain for fifteen years is a weaker engine than its raw earnings numbers suggest. The schools that do the most for mobility tend to be ones where low-income students pay relatively little out of pocket. Always run the question through the filter of what you will actually pay, after aid, and what you’ll owe at the end.
How to read the data yourself
The good news is that you no longer have to take any of this on faith. Much of the underlying data is public, and you can interrogate a school directly. A few questions worth bringing to any college’s published outcomes:
- What fraction of students come from the bottom income quintile? This is the access number. A vanishingly small figure tells you the school is, whatever its other virtues, not primarily a mobility institution.
- What do students from low-income families earn ten years out? Filter to the starting point that matches yours. The headline average is the wrong number for most families.
- What is the net price for a family at your income level? Sticker prices are nearly meaningless. The published net-price-by-income tables are far closer to the truth.
- What share of students borrow, and how much do they owe? Debt is the silent variable that turns a good mobility story into a mediocre one.
- Do students from your background actually graduate? An institution only moves you up if you finish. Completion rates, broken out by income, are part of the picture.
If a school is genuinely an engine of mobility, these numbers will look good for people who start where you start — not just on average, and not just for the students who were already advantaged.
A better question to bring to the table
I’ll end where I began, with the question families are really asking and don’t always know how to phrase.
For most of the history of college admissions, the implicit question has been: How prestigious a school can I get into? It’s an understandable question. Prestige feels like a guarantee, a hedge, a signal you can send for the rest of your life. But it’s the wrong question, because it points at the input — the difficulty of getting in — and ignores the output, which is the only thing you actually care about.
The better question, the one the data finally lets us answer, is this: Where will I be lifted the furthest from where I’m starting?
Sometimes the answer to that question is a famous name. More often, and more surprisingly, it’s a regional public university with a 90% acceptance rate and a parking lot instead of a quad — a place that has quietly moved more students out of poverty than its glamorous neighbors ever will. That school will never top the conventional rankings, because the conventional rankings don’t measure the thing it’s best at.
You can, though. You now have the data to look past the reputation and ask what a college actually does to the lives that pass through it. Use it. The number that should change your decision is not the one printed in the magazine. It’s the one that tells you how far a student like you tends to climb. Pick the school that climbs the furthest — and let the rankings worry about themselves.
A note on the evidence: the framework described here — measuring a college’s contribution to upward mobility as the product of access and success, and following students from their parents’ income rank to their own — comes from a body of research that linked anonymized tax records to college enrollment data for millions of students. The findings are robust and, in places, genuinely counterintuitive. The most useful thing you can do with them is treat your own college decision as an empirical question rather than a question of prestige.