摘要：Starting from the Optimum Currency Area (OCA), this paper utilize the Vector Error Correction Model (VECM) to identify the dynamic short term and the long term co-movement between the ASEAN 4 currencies, including their existing fundamental mechanism. There are at least 3 important findings, (i) the co-movement between the ASEAN 4 currencies is not proved empirically, (ii) the theory of OCA does not robust in explaining the co-movement pattern in ASEAN, and (iii) the existance of OCA is a global phenomena, indicated from the significance of Yen currency on the ASEAN 4. These findings led to a conclusion of this paper that the ongoing economic integration as well as the financial one in ASEAN are not enough to form a unified monetary arrangement nor a common currency in this region.
