Your Parents' Income Predicts Yours (The Data)

A child's first address is a prediction. Intergenerational mobility measures how reliably that prediction holds, how closely adult income follows parents' income. In a perfectly open society, it would not. In the United States, it holds more tightly than most Americans believe.

How is intergenerational mobility measured?

Economists compare a child's income rank in adulthood with the parents' rank. Raj Chetty and colleagues at Opportunity Insights linked tax records across generations to measure it for millions of families.

The most intuitive measure is the chance a child born in the bottom fifth of the income distribution ends up in the top fifth. Pure randomness would put that at 20%. Perfect rigidity would put it at 0%. Every real country falls between.

Does it matter more where you grow up?

Yes. The same study found upward mobility varies sharply by place. A child raised in a low-income family in Salt Lake City has roughly a 10% to 11% chance of reaching the top fifth, while one raised in Charlotte has about a 4% chance. Both are American cities, with the same federal government, and the odds differ by more than two to one.

Opportunity Insights linked better mobility to less residential segregation, better schools, more stable family structures, and lower local inequality. Follow-up research found that children who move to better-opportunity neighborhoods earlier in childhood do measurably better as adults. The geography is covered in geographic inequality, and the rural side in rural poverty.

Who gets into the best colleges?

College is a ladder, and its first rungs sit higher for wealthier families. Opportunity Insights found children from the top 1% of families are about 77 times more likely to attend an Ivy-plus college than children from the bottom fifth. Many of those wealthy students are admitted with credentials similar to lower-income applicants. Legacy preferences, athletic recruiting, and private-school pipelines tilt the field.

The cost side compounds it. Average student loan debt is about $38,000 per borrower (Federal Reserve), and total outstanding student debt is roughly $1.7 trillion. Families without savings borrow, and families with wealth do not. See student debt by generation.

Is the gap bigger for some groups?

Yes. Opportunity Insights' 2018 analysis found that Black boys raised in families with the same income as white boys earn less as adults in the vast majority of neighborhoods. The gap persisted after accounting for family structure and parental education. Research on wealth transmission, including inheritance and the wealth gap and the racial wealth gap, shows why income alone understates the head start.

What does the "American dream" claim get right?

Fair treatment matters. Many children from low-income families do rise, often into the middle of the distribution. Absolute income gains were real for most cohorts. The dream is not a myth.

What the data rejects is the strong version, that your background hardly matters. The U.S. level of mobility is lower than the level in several peer countries, and the gap lies at the extremes: the climb from the bottom to the top is rare and getting no easier.

Why do parents' resources compound?

The mechanism is not mysterious. It starts before kindergarten and keeps going.

Raising a child to 18 costs commonly cited figures near $300,000 or more (Brookings and USDA-derived estimates). Full-time center-based childcare alone runs $10,000 to $17,000 or more per child per year in many states (Child Care Aware). Families with money buy early learning, tutoring, stable housing in strong school districts, and a financial cushion when things go wrong. Families without it make hard tradeoffs, and a single bad year can set a child back.

The same logic applies later. A family that can cover tuition without borrowing sends a graduate into the workforce debt-free. A family that cannot sends one with a monthly payment. Wealth then carries forward to the next generation as down payments and inheritances, so advantages stack up over time instead of resetting.

None of this means effort does not matter. It means effort is working against a different starting line for different children.

Can you look up your own area?

Yes. Opportunity Insights, with the Census Bureau, built a free tool called the Opportunity Atlas. It shows, by Census tract, the average adult outcomes of children who grew up there, broken down by parental income, race, and gender. It is based on the same linked tax data behind the studies above.

The Atlas is a useful reality check for a simple reason. It shows that outcomes vary block by block, not just state by state. Two neighborhoods in the same city can sit at opposite ends of the mobility range. That tells you the variation is about local conditions, not the character of the people who live there.

Policy follows from that. If place causes part of the gap, then housing policy, school funding, and zoning are mobility policy too. See why America doesn't build more housing and zoning laws and the housing shortage for how rules decide who can live near opportunity.

What would raise mobility?

Researchers point to a short list with decent evidence: high-quality early childhood programs, reduced residential segregation and housing that lets families move to higher-opportunity areas, lower college costs and stronger aid, and a wage floor that supports parents. The federal minimum wage has been $7.25 since 2009 (U.S. Dept. of Labor), so the first rung under a parent has not moved in sixteen years. Related: universal pre-K and the Head Start program.

For the full picture, see our income inequality pillar and the American dream is broken. The companion piece on absolute mobility is income mobility in America.

A child's odds should not depend on a zip code and a tax bracket they did not choose. In the United States they do, more than in many peer countries, because early opportunity, college access, and wealth all compound family advantage. The fix is to make the early rungs, school, housing, and health, available to every child. Mobility is built, not hoped for.