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ralph lauren polo


First Author:
 
Masaki Narukawa
Tohoku University
narukawa@econ.tohoku.ac.jp
 
27-1 Kawauchi, Aoba-ku
Sendai, 980-8576, Japan
 
 
 

Second Author:

Katsuhito Nohara
Tohoku University
k-nohara@econ.tohoku.ac.jp
 
Sendai, 980-8576, Japan