1. School of Economics, University of Cape Town, Cape Town, South Africa
2. Water and Production Economics, University of Cape Town, Cape Town, South Africa
3. Department of Agricultural Economics and Farm Management, University of Ilorin, Ilorin, Nigeria
4. Department of Industrial Engineering, Tshwane University of Technology, Pretoria, South Africa
5. Department of Agricultural, Environment, and Development Economics, Ohio State University, Columbus, USA