First Author:   Wempi Saputra Graduate School of Economics, Nagoya University w_saputra2002@yahoo.com   Graduate School of Economics, Nagoya University, Furo-cho, Chikusa-ku Nagoya, 464-8601, Japan   +81-52-789-2358(Phone) +81-52-789-2358(Fax) http://www.soec.nagoya-u.ac.jp/