First Author:   Burak Can Maastricht University b.can@maastrichtuniversity.nl   P.O. Box 616 Maastricht, 6200 MD, the Netherlands   +31433883807(Phone) +31433883807(Fax) http://www.personeel.unimaas.nl/b.Can/ Second Author: Orhan Erdem Borsa Istanbul Orhan.Erdem@borsaistanbul.com   , Turkey   +90 212 298 22 20(Phone)