**Author details**

Sung Jin Kang and Seon Ju Lee\* Department of Economics, Korea University, Seoul, Republic of Korea

\*Address all correspondence to: lgm3525@korea.ac.kr

© 2021 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
