1. Department of Industry and Market, Korea Development Institute , 263 Namsejong-ro, Sejong 30149, Republic of Korea . e-mail: sunghoon.chung@kdi.re.kr
2. Department of Industry and Market, Korea Development Institute , 263 Namsejong-ro, Sejong 30149, Republic of Korea . e-mail: minhokim@kdi.re.kr