LAUSR

Some interventions are intended to benefit both individuals and the groups to which they belong. When a treatment to one individual exerts a causal effect on others, the treatment is said to exhibit spillover, dissemination, or interference. However, defining meaningful causal effects under spillover can be challenging. In this commentary, we discuss the meaning of the "individual effect", a quantity proposed to summarize the effect of treatment on the individual who receives it, when spillover may be present.