Spillovers of prosocial motivation are crucial for the formation of social capital. They facilitate interactions among individuals and create social multipliers that amplify the effects of policy interventions. We conducted a large-scale intervention study among dyads of blood donors to...

Spillovers of prosocial motivation are crucial for the formation of social capital. They facilitate interactions among individuals and create social multipliers that amplify the effects of policy interventions. We conducted a large-scale intervention study among dyads of blood donors to...

Spillovers of prosocial motivation are crucial for the formation of social capital. They facilitate interactions among individuals and create social multipliers that amplify the effects of policy interventions. We conducted a large-scale intervention study among dyads of blood donors to...

Spillovers of prosocial motivation are crucial for the formation of social capital. They facilitate interactions among individuals and create social multipliers that amplify the effects of policy interventions. We conducted a large-scale intervention study among dyads of blood donors to...

Spillovers of prosocial motivation are crucial for the formation of social capital. They facilitate interactions among individuals and create social multipliers that amplify the effects of policy interventions. We conducted a large-scale intervention study among dyads of blood donors to...

An increasingly popular trend in online businesses is the adoption of the freemium model, in which premium features are provided along with free features. By providing free features to a large fraction of users and by managing the social interactions between users and their friends, online...

We identify peer and contextual effects in social interactions models with endogenous covariates (e.g., self-selected treatments). Unobserved individual characteristics are correlated with these endogenous covariates and affect peer outcomes in the reduced form. Our method uses instruments for...

We study unique data from a dynamic natural experiment involving more than 7,000 American women to understand how a woman's propensity to perform an annual mammography changes over time after a co-worker is diagnosed with breast cancer. We find that in the year this event occurs the probability...