The opioid epidemic is a major public health problem that affects millions of people around the world. This paper addresses one challenge identified on the demand side of the epidemic: A large proportion of patients prescribed opioids lose track of their unused pills or save them for future use....

This article argues that public opinion regarding the legitimacy of income differences is influenced by actual income inequality. When income differences are (perceived to be) high, the public thinks of larger income inequality as legitimate. The phenomenon is explained by the system...

Widespread acceptance of COVID-19 vaccines is crucial for achieving sufficient immunization coverage to end the global pandemic, yet few studies have investigated COVID-19 vaccination attitudes in lower-income countries, where large-scale vaccination is just beginning. We analyze COVID-19...

Decisions, both moral and mundane, about saving individuals or resources at risk are often influenced not only by numbers saved and lost, but also by proportions of groups saved and lost. Consider choosing between a program that saves 60 of 240 lives at risk and one that saves 50 of 100. The...