Agricultural Economics 32 (Supplement S1) (January 2005): 135-146

Previously published in Reshaping Agriculture's Contributions to Society; Proceedings of the Twenty-Fifth International Conference of Agricutlural Economists Held at Durban, South Africa, 16-22 August, 2003,  eds. David Colman and Nick Vink, (Malden, MA: Blackwell Publishing, 2005), pp. 135-146