[1] Tech Univ Dresden, Dept Business Management & Econ, D-01062 Dresden, Germany
[2] Univ Lille Nord France, Lille Sch Finance, F-59777 Euralille, France
[3] Middlesex Univ, London NW4 4BT, England
[4] Univ Gesamthsch Paderborn, Dept Econ, D-33098 Paderborn, Germany