1. Professor Emeritus, Food and Resource Economics Dept., Univ. of Florida, P.O. Box 110240, Gainesville, FL 32611-0240.
2. Rinker (Associate) Professor of Construction, Rinker School of Building Construction, Univ. of Florida, P.O. Box 115703, Gainesville, FL 23611 (corresponding author).
3. Reader, School of Architecture and the Built Environment, Univ. of Westminster, 35 Marylebone Rd., London NW1 5LS, UK.