The article discusses why countries don't always work together to solve problems like war, protectionism, and environmental damage. Even though everyone would benefit from cooperation, some issues make it hard to agree on solutions. The researchers show that not all problems can be solved the same way, and some problems are harder to fix because of how the rules are set up. They found that different types of coordination problems can make it difficult for countries to cooperate, especially when some actors care more about their position compared to others. Overall, the study highlights the challenges countries face in working together to achieve better outcomes for everyone.