Intergenerational mobility

Intergenerational mobility is typically quantified using the intergenerational income elasticity (IGE), which measures the percentage difference in a child's income associated with a 1% difference in parental income. A higher IGE indicates lower mobility. In the United States, the IGE is estimated between 0.5 and 0.6, meaning that a child from a family with income 50% above the average tends to earn about 25–30% more than a child from an average family.¹ In contrast, Nordic countries like Denmark and Finland exhibit IGEs around 0.2–0.3, reflecting greater mobility.²

Rank-based measures, such as the correlation between parent and child income ranks, are increasingly used because they are less sensitive to income distribution changes. Studies using these measures show that mobility has remained relatively stable in the US over recent decades, despite rising inequality.³ Educational mobility, measured by the association between parental education and child educational attainment, is also a key component, with global correlations around 0.3–0.4.

Multiple factors drive intergenerational persistence. Human capital transmission—through genetics, parenting, and investment in education—is a primary channel. Parental income affects children's health, cognitive development, and educational opportunities, creating cumulative advantages.⁴ Neighborhood effects also matter: children growing up in high-poverty areas experience lower mobility, as shown by the Opportunity Atlas, which maps mobility by census tract.⁵

Labor market structures, such as unionization and minimum wage levels, influence mobility by shaping the returns to education and the availability of middle-class jobs. Social networks and cultural capital, including norms and aspirations, further transmit status. Public policies—progressive taxation, early childhood education, and universal healthcare—can mitigate these effects, explaining cross-country differences. For instance, the intergenerational transmission of income is weaker in countries with more generous welfare states.²

Intergenerational mobility is often used as a benchmark for equality of opportunity. High mobility is associated with a meritocratic ideal, where individual effort and talent, rather than family background, determine outcomes. However, scholars debate whether mobility should be the primary policy goal, as some inequality may be acceptable if mobility is high. The 'Great Gatsby Curve' illustrates a negative correlation between income inequality and mobility across countries, suggesting that reducing inequality could enhance mobility.⁶

Policies aimed at improving mobility include early childhood interventions, educational reforms, and anti-poverty programs. The Moving to Opportunity experiment, which provided housing vouchers to low-income families, showed mixed effects on children's long-term outcomes, with benefits emerging for those who moved before age 13.⁷ Debates also center on the role of race and gender, as mobility varies significantly across demographic groups, with Black Americans experiencing lower upward mobility than white Americans even after controlling for parental income.⁵

Beyond income, intergenerational mobility extends to health, crime, and even surname persistence. Studies of rare surnames in England show that socioeconomic status persisted over centuries, indicating deep-rooted transmission mechanisms.⁸ In developing countries, mobility is often lower due to credit constraints and poor public services, but microfinance and conditional cash transfers have shown potential to break cycles of poverty.

Another niche area is the study of 'absolute mobility'—whether children are better off than their parents in absolute terms—which has declined in the US, even as relative mobility remained stable.³ Additionally, the 'intergenerational transmission of advantage' includes non-economic dimensions like political participation and civic engagement. Research also examines the role of assortative mating: when high-income individuals marry each other, inequality and persistence increase. Finally, the 'Great Gatsby Curve' itself has been critiqued for its cross-sectional nature, with some arguing that causality runs from mobility to inequality rather than the reverse.⁶

Intergenerational income elasticity (IGE)

A measure of the percentage change in a child's income associated with a 1% change in parental income; higher values indicate lower mobility.

Great Gatsby Curve

A graphical representation showing a negative correlation between income inequality and intergenerational mobility across countries.

Absolute mobility

The proportion of children who have higher income than their parents at the same age, regardless of relative position.