Income Segregation: Up or Down, and for Whom?

Area of Science:

• Sociology
• Demography
• Economics

Background:

• Estimates of rising income segregation in the US post-2000 may be upwardly biased due to reduced sample sizes.
• Previous studies used public data to estimate sample-count bias, but systematic biases from sample size and weighting remain.
• Accurate measurement of income segregation is crucial for understanding socioeconomic trends.

Purpose of the Study:

• To provide more accurate estimates of family income segregation trends in the United States.
• To identify and correct for systematic biases in segregation measurement, including sample size and data weighting.
• To analyze segregation trends across different family types, racial/ethnic groups, and income levels.

Main Methods:

• Utilized new correction methods applied to original census sample data for individual households.
• Analyzed biases associated with sample size and the use of weighted sample data in segregation estimation.
• Conducted separate analyses by race/ethnicity and the presence of children in families.

Main Results:

• Family income segregation increased significantly in the 1980s, with more selective changes after 1990.
• Segregation declined for some family categories post-1990, but showed an upward trend for families with children.
• Income segregation was not consistently higher for Black and Hispanic families compared to White families; trends varied significantly by race/ethnicity, presence of children, and income distribution.

Conclusions:

• Post-1990 income segregation trends are nuanced, not uniformly increasing across all family types or demographic groups.
• Specific subgroups, such as Hispanic families with children in the upper income bracket, experienced notable increases in segregation.
• Understanding the diverse processes driving income segregation requires detailed analysis of intersecting demographic factors.