Definición:
Producto o servicio medioambiental de cuya existencia puede aprovecharse un individuo sin reducir el beneficio que otra persona puede recibir del mismo producto o servicio.
Fuente:
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
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