Assigning a high-attendance social identity motivated patients with opioid use disorder to attend methadone treatment at least as much as a modest financial incentive. 

Helping parents better understand their children improves adolescent well-being, but academic effects depend on students’ stage of schooling. 

Time-based penalties accelerate task completion at the cost of accuracy, while verification disclosure alone slows workers without meaningfully improving quality, yet combining the two preserves the speed gains of the penalty while eliminating its quality loss, revealing a complementarity between financial incentives and soft monitoring in managing the speed–quality tradeoff. 

A low-cost parent-directed empathy program increased empathy, reduced bullying for at least one year, and improved later high school entrance exam performance. 

A parental empathy and positive-parenting program alleviated “Middle-School Blues” by improving parenting skills, parental involvement, and children’s non-cognitive abilities. 

A job-interview program with employer hiring subsidies sharply increased employment, with gains persisting after the subsidies ended. 

Having more daughters improves older parents’ well-being through better health, greater financial support, more leisure, and less work, especially among vulnerable parents.