[1] IU Univ Appl Sci, Dept Econ & Finance, Bad Honnef, Germany
[2] IU Univ Appl Sci, Bad Honnef, Germany
[3] Fayetteville State Univ, Broadwell Coll Business & Econ, Dept Accounting Finance Hlth Care & Informat Syst, Fayetteville, NC USA
[4] Coventry Univ, Sch Econ Finance & Accounting, Coventry, England