The Distribution of Social Capital across Individuals and its Relationship to Income

There have been several attempts to measure social capital—the value inhering in relationships—at an aggregate level, but researchers lack comprehensive individual-level social capital measures. Using a combination of direct linkage and imputation across several nationally representative datasets, we produce a comprehensive measure of social capital at the individual level. We validate our measure by aggregating it to the state level, finding strong correlations with existing state-level social capital measures. We document substantial social capital disparities between white Americans, on the one hand, and black and Hispanic Americans, on the other, as well as a strong educational gradient, which is comparatively weaker for Hispanics. We also provide new evidence on the relationship between income and social capital, using a comprehensive measure of income. We find that social capital increases with income but at a decreasing rate. The source of income matters, as an extra $10,000 in market income is associated with a 0.23 standard deviation increase in social capital for those with the lowest levels of market income, while an extra $10,000 in government transfer income is associated with a 0.08 standard deviation decrease.