1. Lecturer, Discipline of Agricultural Economics, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, Pietermaritzburg, South Africa.
2. Professor, Department of Agricultural Economics, Faculty of Natural and Agricultural Sciences, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa.
3. Post doctoral fellow, Department of Agriculture and Animal Health, School of Agriculture and Life Sciences, University of South Africa, Roodepoort, 1709, Gauteng, South Africa.