Stock returns series generally exhibit time-varying volatility. Therefore, one can cast doubt on the way abnormal returns are calculated and consequently interpreted in traditional event studies. In this paper we apply a market model which accounts for GARCH effects leading to more efficient...

As was establihed in Llorenteetal (2001) the dynamic relationship between return and volume is a function of information asymmetry. This study extends their analysis by linking the volume induced return auto correlarion coefficients with the level of disclosed insider trading. Using New Zealand...