Threshold common pool resource dilemmas, such as fisheries or groundwater reserves, are important topic for policy-makers. Uncertainty about the threshold for sustainable use or number of resource users may exacerbate the overconsumption problem. We are first to investigate the joint impact of...

For a variety of public goods projects, the exact return from provision is not known. We design an experiment to test the impact of an uncertain return on voluntary contributions. An uncertain return may be caused by either nature (the benefits of building a dyke depend on the frequency and...