1. Dept. of Agricultural Economics, Faculty of Agricultural Economics, Univ. of Tabriz, Tabriz 5166/15731, Iran (corresponding author).
2. Professsor, Dept. of Agricultural Economics, Faculty of Agricultural Economics, Univ. of Tehran, Karaj, Tehran 14155-6619, Iran.
3. Assistant Professor and Visiting Professor, Dept. of Administrative Studies, Faculty of Liberal Arts and Professional Studies, York Univ., ON, Canada M5R 0A3.
4. Professsor, Dept. of Agricultural Economics, Faculty of Agricultural Economics, Univ. of Tabriz, Tabriz 5166/15731, Iran.