INDIVIDUAL RESTRAINT AND GROUP EFFICIENCY IN COMMONS DILEMMAS - THE EFFECTS OF 2 TYPES OF ENVIRONMENTAL UNCERTAINTY

In most real-world commons, the exact resource quantity is rarely know n, and the rate at which the resource regenerates is not always predic table. Annual salmon runs, for example, are based on breeding rates an d many other factors; those fishing never know exactly how many fish w ill be available for next year's season. The present study employed a computerized commons dilemma simulation to investigate the impact of u ncertainty in pool size and regeneration rate on individuals harvest c hoice and the efficiency with which groups managed the resource pool. Both types of uncertainty produced significant declines in individual restraint and group efficiency, although the group-level effects tende d to be stronger than those at the individual level. Implications for the management of real-world commons are discussed.