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Economic Connectedness Predicts Mobility
- Economic connectedness measures how many friends a low-income person has who are above median income.
- A poor person's fraction of above-median friends predicts their opportunities and potential mobility long-term.
Inferring Income From Digital Signals
- Facebook network data plus machine learning inferred users' socioeconomic status using location, device, schools, and usage patterns.
- These inferred incomes allowed large-scale measurement of cross-class friendships across regions and institutions.
High School Friendships Shape Futures
- High-school friends' parents' incomes strongly predict a student's eventual earnings even after controlling for parental income.
- Peer norms, information about college, and direct referrals from friends' networks drive that predictive power.