The Covid-19 pandemic has induced worldwide natural experiments on the effects of crowds. We exploit one of these experiments currently taking place over several countries in almost identical settings: professional football matches played behind closed doors. We find large and statistically...

Because no-show behavior typically leads to operational inefficiencies and thus diminishing returns for service firms, a growing number of authors have demonstrated the potential of using reminders to reduce no-show rates. In this study, by examining the behavioral responses of 13,911 season...