[1] Univ Palermo, Dept Econ Business & Stat, Viale Sci,Bld 13, I-90128 Palermo, Italy
[2] Aston Univ, Aston Business Sch, Dept Econ Finance & Entrepreneurship, Birmingham B4 7UP, England
[3] Univ Lincoln, Coll Social Sci, Sch Social & Polit Sci, Lincoln LN6 7TS, England