Leveraging Big Data to Rebuild the American Dream: Understanding and Enhancing Economic Opportunity and Social Mobility

Raj Chetty, Professor of Economics at Harvard University and Director of Opportunity Insights, discusses how large-scale data is revolutionizing the study of social mobility and economic opportunity. He highlights a dramatic decline in the American Dream, where only about half of children today earn more than their parents, a stark contrast to 92% for the 1940 cohort. His research group utilizes anonymized tax records, census data, and social network data from platforms like Facebook to construct granular tools, such as the Opportunity Atlas, which provide neighborhood-level insights into upward mobility prospects and the underlying drivers of economic success.

The research reveals significant variation in opportunity even within the same city, underscoring the critical role of childhood environment; earlier exposure to high-opportunity areas leads to substantially better long-term outcomes, while adult moves have minimal impact. Key determinants identified include the quality of local schools, access to higher education, segregation, and social connections. A pivotal finding is the concept of "economic connectedness"—the extent of cross-class interaction, measured by the fraction of high-income friends low-income individuals have—which emerges as the single strongest predictor of upward economic mobility. This connection is posited to influence mobility through direct job referrals and, more profoundly, by shaping aspirations and broadening career pathways.

To address these challenges, the podcast outlines three primary policy approaches. First, reducing segregation by redesigning affordable housing and housing voucher policies to facilitate low-income families' access to higher-opportunity neighborhoods. Second, implementing place-based investments to transform existing low-opportunity areas into vibrant, mixed-income communities, thereby bringing opportunity directly to residents. Third, improving access to and outcomes from higher education for low-income students, focusing on institutions that both enroll diverse student bodies and provide strong post-graduation earning potential, while also enhancing outcomes at colleges that currently serve many low-income students but lack effective pathways.

Chetty emphasizes that while the research is currently focused on the United States, a global network of researchers is applying similar methodologies to understand social mobility in diverse contexts, recognizing both universal themes like social capital and context-specific "fault lines" such as race, caste, or religion. He concludes with optimism, noting that creating economic opportunity is a universally shared goal that transcends political divides, unlike debates over equality of outcomes. The transparency and communicative power of large-scale data empower policymakers and citizens to collaboratively address these complex issues, fostering hope for impactful change in a time when many feel excluded from societal progress.

simple statistics with very large scale data can be a very powerful tool for communication

the idea that everyone should have a chance of moving up in society that's what social Mobility is about that's how I think about Economic Opportunity more broadly

if you look at kids born back in the middle of the last century say take a child born in 1940 we estimate that 92% of those kids in real terms adjusting for inflation went on to earn more than their parents did but over time that notion of the American dream has faded

in some sense it's become a coin flip as to whether you're going to achieve the American dream

I liken it to having a microscope for the first time to be able to study these questions

a key driver of economic Mobility is your childhood environment that earlier you move to an area that offers better opportunities for Upward mobility in childhood the better your outcomes in the long run

economic connectedness the fraction of high-income friends that low-income people have... turns out to be the single strongest predictor of upward economic Mobility

many jobs in the US and many other countries as well are obtained through referral girls through a friend or through a connection who connects you to a potential employer

I actually think a deeper mechanism that may be very important is changes and aspirations that children have when they're connected to different sets of people

the determinants of economic Mobility are hyperlocal it's about the particular neighborhood and social community in which you grow up from something like birth till age 20 or so

the goal of creating Economic Opportunity I found is pretty Universal it doesn't matter what side of the political Spectrum you're on where you come from I think pretty much everyone agrees that no matter your background you should have a shot of succeeding if you work hard

simple statistics with very large scale data can be a very powerful tool for communication and because of all that we're actually finding that even in this polarized climate there's a lot of interest among policymakers