[1] Curtin Univ Technol, Dept Econometr & Quantitat Modelling, Perth, WA, Australia
[2] Chalmers, Dept Technol Management & Econ, S-41296 Gothenburg, Sweden
[3] Osaka Univ, Osaka, Japan
[4] Curtin Univ Technol, Commun Econ & Elect Markets Res Ctr, Perth, WA, Australia