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First Author:
 
Yasunobu Tomoda
Graduate School of Economics and Business Administration, Hokkaido University
tomoda@pop.econ.hokudai.ac.jp
 
Kita-9, Nishi-7, Kita-ku
Sapporo, 060-0809, Japan
 
 
 

Second Author:

Hiroshi Kurata
Graduate School of Economics and Business Administration, Hokkaido University
kura@pop.econ.hokudai.ac.jp
 
Kita-9, Nishi-7, Kita-ku
Sapporo, 060-0809, Japan