Economists have long been aware of utility externalities such as a tendency to compare own income with others'. If welfare losses from income comparisons are significant, any governmental interventions that alter such attitudes may have large welfare consequences. We conduct an original online...

We evaluate the impact of government mandated proof of vaccination requirements for access to public venues and non-essential businesses on COVID-19 vaccine uptake. We find that the announcement of a mandate is associated with a rapid and significant surge in new vaccinations (more than 60\%...