Institution: | a Economic Science Laboratory, University of Arizona, Tucson, AZ 85721, USA;b Department of Agricultural and Resource Economics, University of California at Davis, Davis, CA 95616, USA;c Institute of Transportation Studies, University of California at Davis, Davis, California, 95616, USA;d Department of Economics, University of California at San Diego, La Jolla, California, 92093, USA;e Environmental Economics Division, Office of Policy, US Environmental Protection Agency, Washington, DC 20460, USA |