1. School of Economics, Sogang University, Seoul, Korea
2. Department of Energy Policy and Engineering, KEPCO International Nuclear Graduate School, Ulsan, Korea
3. Department of Public Policy, KDI School of Public Policy & Management, Sejong, Korea
4. Department of Economics and Finance, Sangmyung University, Seoul, Korea
5. Sauder School of Business, University of British Columbia, Vancouver, BC, Canada