First Author:   Joe Stone University of Oregon jstone@uoregon.edu   Department of Economics, University of Oregon Eugene, 97403, USA   541-346-3902(Phone) 541-346-3902(Fax) Second Author: Jo Anna Gray University of Oregon jgray@uoregon.edu   Department of Economics, University of Oregon Eugene, 97403, USA   541-346-4663(Phone)