Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Employing an augmented univariate EGARCH model, we estimate the dynamic impact of information arrival as measured by volume on asymmetric news in the pre and post 2009 global financial crisis in the Athens Stock Exchange (ASE). Our results reveal that trading volume appears to capture a significant part of volatility asymmetric behavior. In general, our results provide evidence in favor of the Mixture of Distribution Hypothesis (MDH). Our results contain significant policy implications for investors and regulatory authorities.