Definition:
Gain global net pour la société généré par l’allocation de ressources à l’économie, mesuré en valorisant les avantages engendrés par l’utilisation de ces ressources, puis en en déduisant les coûts.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
Edward B. Barbier, Mike Acreman, and Duncan Knowler, 1997, Economic Valuation of Wetlands: a Guide for Policy Makers and Planners, Ramsar