[1] Univ Warsaw, Fac Management, Szturmowa St 1-3, PL-02678 Warsaw, Poland
[2] Warsaw Univ Life Sci, Inst Econ & Finance, Nowoursynowska St 166, PL-02787 Warsaw, Poland
[3] Warsaw Management Univ, Fac Management & Tech Sci, Kaweczynska St 36, PL-03772 Warsaw, Poland