The article looks at how to fairly divide the costs and benefits of multiple public goods. By using the equal factor equivalent rule, every person can be happy with the public goods they get and the price they pay. This rule aims to make sure everyone feels like they are getting a good deal. The researchers found that by setting a low cost ratio, people are more likely to agree on who gets what public goods and how much they should pay for them. Ultimately, the goal is to come up with a system that makes everyone feel like they are getting a fair share of the public goods without paying too much.