[1] E China Normal Univ, Sch Finance & Stat, Shanghai 200241, Peoples R China
[2] Univ New S Wales, Australian Sch Business, Sch Risk & Actuarial Studies, Sydney, NSW 2052, Australia
[3] Univ New S Wales, Australian Sch Business, CEPAR, Sydney, NSW 2052, Australia
[4] City Univ London, Cass Business Sch, London EC1Y 8TZ, England
[5] Macquarie Univ, Fac Business & Econ, Dept Appl Finance & Actuarial Studies, Sydney, NSW 2109, Australia