When a parent opens the mail and acts as though nothing is wrong, a certain type of silence descends upon the kitchen. The majority of us who were poor as children recall that silence. Decades later, it still murmurs when the credit card bill comes in. We didn’t give it a name at the time, but we put it away somewhere. For many years, economists courteously disregarded this, while therapists nodded knowingly. At last, the data has matched the emotion.
The goal of Raj Chetty’s Harvard team was not to validate anyone’s emotional baggage. They were pursuing something more significant.
| Field | Details |
|---|---|
| Lead Researcher | Raj Chetty, William A. Ackman Professor of Public Economics, Harvard |
| Affiliated Institution | Opportunity Insights, Harvard University |
| Co-Authors | Johannes Stroebel and Theresa Kuchler (NYU), Matthew O. Jackson (Stanford & Santa Fe Institute) |
| Published In | Nature, August 2022 |
| Dataset Size | 21 billion friendship connections |
| Population Covered | 84% of U.S. adults aged 25–44 |
| Core Concept | “Economic Connectedness” and cross-class interaction |
| Earlier Foundational Work | The 2018 Opportunity Atlas (mapping mobility by ZIP code) |
| Related Childhood Finding | A 2013 Cambridge University study showing money habits form by age 7 |
| Estimated Cost of Emotional Investing | Roughly 2% in foregone returns each year, per a FTAdviser report |
They created what is likely the most comprehensive map of social life ever put together in this nation using privacy-protected data from 21 billion Facebook connections, which astonishingly includes about 84% of American adults between the ages of 25 and 44. The paper’s headline finding, which appeared in Nature, was surprisingly straightforward: children who grew up with peers who made more money tended to make more money themselves. Not because someone got them a job when they were 22. Because of something much more difficult to quantify. “It shapes your aspirations,” Chetty told the Harvard Gazette. “It shapes the things that you think about, the career paths you think about pursuing.” You probably don’t see yourself applying if you’ve never met anyone who attended college.
That is a quantifiable economic force, not a metaphor. Chetty refers to it as “economic connectedness,” and the maps his team created bear a striking resemblance to the upward mobility maps they published in the Opportunity Atlas years prior. There is no subtle overlap. The two patterns match so perfectly that it’s almost embarrassing.
This is the uncomfortable part of the story, though. The polite version of this research often ignores the findings of the second paper in the series. Even when wealthy and impoverished children attend the same school, live in the same neighborhood, or attend the same college, they frequently don’t end up becoming friends. It was dubbed “friending bias” by the researchers. Strangely enough, churches and recreational organizations are better at rearranging the classes than top universities or high schools. It turns out that having people in the same building is not the same as allowing them to actually interact.
Add to that a 2013 Cambridge University study that suggested core money habits, such as how you manage fear, how you think about the future, and whether you flinch at a balance, are mostly formed by the age of seven. Seven. Long before compound interest is explained. The Cambridge researchers were cautious because rewiring these patterns in the future is genuinely challenging but not impossible. which is consistent with what financial planners observe on a weekly basis in their offices. Even if someone makes six figures, they refuse to open the brokerage statement. Another person inherits money and spends it all in less than a year. Seldom do the numbers on the page correspond to the sensation in the chest.
As all of this research mounts, it seems like we’ve been talking about financial literacy in the wrong way for a very long time. Budgeting worksheets are taught in schools. According to a Nationwide study, almost 90% of parents of children between the ages of 8 and 13 believe that personal finance classes would be beneficial. They are not incorrect, just lacking. The nervous system is not superseded by mathematical knowledge. No matter how many spreadsheets a child has seen, she will bring that stiffness to her first 401(k) enrollment if she witnessed a parent stiffen at the sight of a brown envelope.
Gently and with the cool authority of massive datasets, Chetty’s work suggests that another seminar isn’t actually the solution. It’s genuine, ongoing, unsupervised contact between people of different social classes. The kind that has become more difficult rather than easier as American neighborhoods become more rigidly divided along income lines. It’s difficult to read the study without getting a little nostalgic. The solution is both clear-cut and nearly impossible to implement. Friendship cannot be regulated. However, you can quit acting as though the wound from a thin upbringing heals on its own.
