Definition:
Value – the worth of good or service, generally measured in terms of what we are willing to pay for it, less what it costs to supply it.
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