1. Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, MD, USA.
2. Carey Business School, Johns Hopkins University, Baltimore, MD, USA.
3. Department of Economics, University of Wyoming, Laramie, WY, USA.
4. Department of Economics, University of Tennessee, Knoxville, TN, USA.
5. Department of Economics, Purdue University, West Lafayette, IN, USA.
6. Haub School of Environment and Natural Resources, University of Wyoming, Laramie, WY, USA.
7. Department of Economics, University of Gothenburg, Gothenburg, Sweden.
8. Department of Technology, Management and Economics, Technical University of Denmark, Kongens Lyngby, Denmark.
9. Department of Economics, University of Alaska-Anchorage, Anchorage, AK, USA.
10. Department of Economics, Tilburg University, Tilburg, Netherlands.
11. Institute of Economics, University of Kassel, Kassel, Germany.
12. Department of Social and Decision Sciences, Carnegie Mellon University, Pittsburgh, PA, USA.
13. Department of Psychology and Neuroscience, University of Colorado, Boulder, CO, USA.