Three Approaches to Defining "Existence" or "Non-Use" Value under Certainty

II DEPARTMENT OF AGRICULTURAL AND RESOURCE ECONOl\flCS DIVISION OF AGRICULTURE AND NATURAL RESOURCES UNIVERSITY OF CALIFORNIA AT BERKELEY II WORKINGPAPERNo. 691 THREE APPROACHES TO DEFINING EXISTENCE OR NON-USE VALUE UNDER CERTAINTY by W. Michael Hanemann Califontia Agricultural Experiment Station Giannini Foundation of Agricultural Economics November, 1993 original text: July,