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We investigate the disposition effect building on Realization Utility Theory and Big Five Model. Our experimental analysis, combining NEO IP-R personality measures with individual financial data from a trading simulation run by 230 individuals, shows that the disposition effect is driven by two distinct psychological processes, one related to holding losers and the other to selling winners. These two behavioral mechanisms are uncorrelated and influenced by different personality traits.

Notwithstanding some caveats (exclusion of gene-gene and gene-environment interactions; simple 5-HTTLPR architecture), this simulation is favourable to incorporate pharmacogenetic test in antidepressant treatment.

This paper investigates the way in which abnormal trading volume reveals new information to market participants. It is generally thought that trading volume is an efficient proxy for information flow and enhances the information set of investors. However, no research has related the presence of abnormal trading volume to firm characteristics, such as ownership and governance structure, which also have a theoretical link to information quality. I find strong excess returns around extreme trading levels, which are only moderately attributable to information disclosure. Moreover, these returns are not caused by liquidity fluctuations since prices do not reverse over the following period. In contrast, there is evidence of price momentum, suggesting that traders can implement successful portfolio strategies based on observation of current volumes. Copyright (c) 2010 Blackwell Publishing Ltd.