United States fisheries are managed by regional councils. Fishermen can participate in fisheries managed by multiple councils, and effort controls in one region could lead to effort leakage into another. Using difference-in-differences, we test for leakage across regional fisheries boundaries...

This paper comments on a recent paper published in the journal Nature that claims that fisheries co-management causes successful outcomes in fisheries. We outline theoretical arguments in favor of and against co-management as an approach to solving fisheries-commons problems. We argue that the...