Cooperativeness among genetically unrelated humans remains a major puzzle in the social sciences. We explore the causal impact of physical distance on willingness to help. In a field setting, participants decide about supporting local refugees at the dispense of money to themselves.
We use the high IQ Terman sample to estimate relationships between education, socioemotional skills, and health-related outcomes that include health behaviors, lifestyles, and health measures across the lifecycle.
Agents in a finite two-sided market make costly investments and are then matched assortatively on the basis of these investments. Besides signaling complementary, privately known types, investments also generate benefits for partners.