1 Department of Finance, Kozminski University, ul. Jagiello?ska 57/59, 03-301 Warsaw, Poland,
2 Department of Financial Management, University of Pretoria, Private Bag x20, Hatfield, Pretoria, 0028, South Africa
3 Department of Finance and Tax, University of Cape Town, Rondebosch, 7700, Cape Town, South Africa.
4 Department of Quantitative Methods & Information Technology, Kozminski University, ul. Jagiello?ska 57/59, 03-301 Warsaw, Poland
5 Department of Accounting and Finance, Business School, Edinburgh Napier University (ENU), 219 Colinton Road, Edinburgh EH14 1DJ, Scotland, United Kingdom