Household and family transmission are strong factors in the spread of SARS-CoV-2, with much higher probabilities of temporally associated infections among family members compared to school contacts. While attending the same school increased the probability of temporally associated infections, the effect was modest compared to the impact of shared household and family contexts.
Dating apps increase the number of casual sexual partners, which in turn increases the overall spread of sexually transmitted diseases.
Policymakers can use costly interventions to align individual behavior with socially optimal outcomes, even when individual and government preferences are misaligned, in the presence of limited healthcare capacity.