Many types of economic and social activities involve significant behavioral complementarities (peer effects) with neighbors in the social network. The same activities often exert externalities that cumulate in "stocks" affecting agents' welfare and incentives. For instance, smoking is subject to...

Smoking, like many health-related behaviors, has "social" aspects. The smoking habits of my neighbors are likely to shape my own smoking habits, due to what is known in economics as “peer effects.” These complementarities in behavior may result from emulation, joint consumption, conformism,...

Chronic loneliness is a serious social problem that appears to be on the rise, and more so after the global COVID-19 pandemic. Some firms have introduced consumer services aimed at fostering social connection, particularly ones that promote interpersonal touch. Such strategies are presumably...