Trading behaviours during stock market bubbles: evidence from Vietnam

We study investors' trading behaviours during bubbles on the Vietnam stock market. Vietnam offers a great setting due to its high susceptibility to bubbles and large heterogeneity among various groups of investors. We document evidence of trading explosions during two bubbles identified in our sample period, followed by reversions in the aftermath. Financial sectors make a significant contribution to this phenomenon in both episodes. We also find that foreign and sophisticated investors increase their holdings when the bubbles form and start selling well before the bursts, suggesting their superior ability to local individuals in timing the market.