Affiliation: | 1. Faculty of Economics, Shiga University, 1-1-1 Banba, Hikone, Shiga, ?522-8522, Japan 2. CREST, JST, 1-1-1 Banba, Hikone, Shiga, 522-8522, Japan 3. Graduate School of Engineering Science and Center for the Study of Finance and Insurance, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka, ?560-8531, Japan 4. CREST, JST, 1-3 Machikaneyama-cho, Toyonaka, Osaka, 560-8531, Japan
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