The article discusses how to decide on providing public goods in a large economy where individual contributions are small. They find that sharing costs equally among people is necessary for the best outcome. However, this approach can be vulnerable to group actions that lower the perceived value of the public good. To prevent this, a fair and robust system should consider the number of people who value the good above or below the cost, rather than just the average value. This research shows a connection between economic decision-making in large groups and voting processes.