Vatthanamixay Chansomphou Graduate School of Internatinal Development and Cooperation, Hiroshima University   1-5-1 Kagamiyama Higashi-Hiroshima, Hiroshima 739-8529 Japan   vatthanamixay@hiroshima-u.ac.jp             JEL Areas: F4 : Macroeconomic Aspects of International Trade and Finance: General C2 : Single Equation Models; Single Variables: General