Junghyun Song Graduate School of Economics, Kobe University, Japan   2-1, Rokkodai-cho, Nada-ku Kobe,, Hyogo 657-8501 Japan   junghyunsong81@gmail.com             JEL Areas: L1 : Market Structure, Firm Strategy, and Market Performance: General L2 : Firm Objectives, Organization, and Behavior: General