An interdisciplinary team set out to establish the economic and social values of the Trinity River in northern California . This information was intended to support the Secretary of the Interior's decision on allocation of Trinity River flows . This team set out to measure the values of Trinity River flows , fishery resources , and rec reation amenities in several different ways . A survey was mailed to users of the Trinity River . This single instrument included economic measures ( willingness - to pay and costs incurred in visiting ) and social - psychological measures ( importance , satisfaction , and water allocation preferences ). A closely related survey measured several of these same values among west coast regional households . The results of these surveys were compiled , and the measured economic and social values were compared . We found that integrating economic and social value information pro vides a greater depth of understanding of the resource's value . In addition , this integration provides a more in - depth understanding through the quantitative and qualitative results that emerge .
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Aaron J. Dougla Jonathan G. Taylor (1999) studied this question.