This study attempts to examine the linkages between the ASEAN-5+3 and U.S. stock markets.
The empirical analysis of this study begins with the Augmented Dickey-Fuller and Phillips-Perron stationarity tests in order to determine at which level do the data exhibit stationarity for the purpose of cointegration analysis application.
Results show that the long-run relationships between ASEAN-5+3 stock markets occur only for during- and post-crisis period.
For the pre-crisis period, there is no significant cointegrating vector among the ASEAN-5+3 stock markets. Before and during-crisis, the number of cointegrating vector increased after US stock market had been included in the model during the crisis.
This implied that the system is more interdependence. Hence, by adding US stock market is not helping investors to reduce the portfolio risk.