Because no villager has a personal incentive to restrict the dimensions of his herd, the herds continue to grow, and eventually their overgrazing destroys the commons. The parable is a useful model for the numerous environmental issues by which the common good is damaged by individuals appearing out of rational self-interest . It applies properly to the rubbish scenario in the many communities the place a free city dump has traditionally been handled as a commons. The 1992 Plan projected that the City would understand internet savings from recycling. The Department’s experience to date in implementing the recycling program diverges from the assumptions of the Plan.