Mr. Kadir Y. Eryigit, Uludag University Faculty of Economics and Administrative SciencesDepartment of Econometrics, Department of Econometrics, Gorukle, Bursa, Turkey, Mr. Suleyman Karaman, Uludag University Faculty of Agriculture, Department of Agricultural Economics, Gorukle, Bursa, Turkey, and Mrs. Pinar Nacak, Izmir Mercantile Exchange, Gazi Bulvari No:2, Izmir, Turkey.