Department of Economics The Faculty of Political Sciences Ankara University 06590 Cebeci Ankara Turkey Tel. : (+90 312) 319 77 20 > 268 Faks: (+90 312) 319 77 36 URL1: http://www.oocities.org/ystezel URL2: http://www.oocities.org/ytezel.geo Email: ytezel@superonline.com