Public goods dilemmas, like climate change and inequality, are tough because people who help can be taken advantage of. Punishments and rewards can help, but they cost money. This study looked at a game where leaders can kick out people who don't help. When leaders are rewarded for the success of the group, cooperation improves. If too many people pay leaders to let them stay, cooperation fails. This shows that rewarding leaders for group success can help solve public goods problems.