Research for this article was funded by financial support from the Program of Research on the Economics of Invasive Species Management (PREISM), the Economic Research Service (ERS) at the U.S. Department of Agriculture (under Cooperative Agreement 43-3AEM-5-80066). Earlier versions of this article were presented at the Western Economic Association International 83rd Annual Conference, Waikiki, Hawaii, June 29–July 3, 2008, the 2008 PREISM Workshop, USDA Economic Research Workshop, October 23–24, 2008, the 43rd Annual Conference of the Canadian Economics Association, May 29–31, 2009, University of Toronto, Ontario and the 17th Annual Conference of the European Association of Environmental and Resource Economists (EAERE), June 24–27, 2009, Amsterdam, The Netherlands, and the 11th BioEcon Conference, September 21–22, 2009, Venice, Italy. We are grateful for valuable comments provided by David Aadland, Bill Hahn, Lori Lynch, Charles F Mason, Donald M. McLeod, Jason F. Shogren, Alexandre Skiba, John Tschirhart, and Amos Zemel. We also benefited from the research assistance of Katie Barndt, Joanne Burgess, Kristin Dust, Arianne Ransom-Hodges, and Lizbeth Seebacher, and from the project assistance of Margie Reis. We thank the assistance at ERS provided by our project liaison, Daniel Pick, and also by Linda Calvin, Barney Caton, Robert Dismukes, Andy Jerardo, Craig Osteen, Craig Ramsey, and Donna Roberts. We are grateful to Gerald Shively and an anonymous referee for helpful comments.
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