Moataz Eliw 1*, Samim S. Alim 2,4 and Sarhan A. Soliman 3
1 Department of Agricultural Economics, Faculty of Agriculture, Al-Azhar University, Assuit, P.O. Box 71524 Egypt.
2 Faculty of Agriculture, Takhar University, Takhar 3702, Afghanistan.
3 Agricultural Economy Research Institute, Agricultural Research Center, Giza, Egypt.
4 Institute of Agricultural Economics and Development, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China