This paper estimates treatment size and status specific peer effects that are not detected by widely-used approaches to the estimation of spillovers. In a field experiment using university students, we find that subjects who have been incentivized to exercise increase gym usage more if they have...

This paper presents new estimates of sibling correlations in health and socioeconomic outcomes over the life course. Sibling correlations provide an omnibus measure of the importance of all family and community influences. I find that sibling correlations in a range of health and socioeconomic...

Economic literature suggests that individual health can be affected not only by an array of individual and family characteristics but also by the individual's social environment. Peer pressure can particularly be significant among adolescents, as the need for social acceptance is vital during...