1. Food and Resource Economics Department and Mid-Florida Research and Education Center; University of Florida; 2725 S. Binion Road Apopka FL 32703 USA
2. Agricultural and Applied Economics; University of Georgia; Athens GA 30602 USA
3. Department of Horticultural Sciences; Texas A&M University; College Station TX 77843 USA
4. Department of Horticulture; Michigan State University; East Lansing MI 48824 USA