Test of clustering volatility effect of Tadawul index using rolling autocorrelation

Capital market liberalization allows the access of foreign investors to Saudi stock market especially since 2005. The test of adaptation to the market volatility exhibits the existence of the volatility clustering in the daily return and volume of traded shares. This finding is corroborated by the absence of variance homoscedasticity using BF test. Also, the results indicate that the period between 11.2002 and 01.2006 is more efficient comparatively to other periods. Furthermore, from the start of 2010, there is a relative