Overconfidence and Trading Volume

Markus Glaser () and Martin Weber
Additional contact information
Markus Glaser: Sonderforschungsbereich 504, Postal: L 13, 15, D-68131 Mannheim

No 03-07, Sonderforschungsbereich 504 Publications from Sonderforschungsbereich 504, Universität Mannheim, Sonderforschungsbereich 504, University of Mannheim

Abstract: Theoretical models predict that overconfident investors will trade more than rational investors. We directly test this hypothesis by correlating individual overconfidence scores with several measures of trading volume of individual investors (number of trades, turnover). Approximately 3000 online broker investors were asked to answer an internet questionnaire which was designed to measure various facets of overconfidence (miscalibration, the better than average effect, illusion of control, unrealistic optimism). The measures of trading volume were calculated by the trades of 215 individual investors who answered the questionnaire. We find that investors who think that they are above average in terms of investment skills or past performance trade more. Measures of miscalibration are, contrary to theory, unrelated to measures of trading volume. This result is striking as theoretical models that incorporate overconfident investors mainly motivate this assumption by the calibration literature and model overconfidence as underestimation of the variance of signals. The results hold even when we control for several other determinants of trading volume in a cross-sectional regression analysis. In connection with other recent findings, we conclude that the usual way of motivating and modelling overconfidence which is mainly based on the calibration literature has to be treated with caution. We argue that our findings present a psychological foundation for the ``differences of opinion'' explanation of high levels of trading volume. In addition, our way of empirically evaluating behavioral finance models - the correlation of economic and psychological variables and the combination of psychometric measures of judgment biases (such as overconfidence scores) and field data - seems to be a promising way to better understand which psychological phenomena drive economic behavior.

Pages: 55 pages
Date: 2003-04-29
New Economics Papers: this item is included in nep-fin, nep-fmk and nep-rmg
Note: Financial support from the Deutsche Forschungsgemeinschaft, SFB 504, at the University of Mannheim, is gratefully acknowledged.
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (14)

Downloads: (external link)
http://www.sfb504.uni-mannheim.de/publications/dp03-07.pdf (application/pdf)

Related works:
Journal Article: Overconfidence and trading volume (2007)
Working Paper: Overconfidence and Trading Volume (2005)
Working Paper: Overconfidence and Trading Volume (2003)
Working Paper: Overconfidence and trading volume (2003)
Journal Article: Overconfidence and trading volume (1990)
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:xrs:sfbmaa:03-07

Ordering information: This working paper can be ordered from

Access Statistics for this paper

More papers in Sonderforschungsbereich 504 Publications from Sonderforschungsbereich 504, Universität Mannheim Contact information at EDIRC., Sonderforschungsbereich 504, University of Mannheim
Bibliographic data for series maintained by Carsten Schmidt ( this e-mail address is bad, please contact ).