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Systematic noise

Brad Barber, Terrance Odean and Ning Zhu

Journal of Financial Markets, 2009, vol. 12, issue 4, 547-569

Abstract: We analyze trading records for 66,465 households at a large discount broker and 665,533 investors at a large retail broker to document that the trading of individuals is highly correlated and persistent. This systematic trading of individual investors is not primarily driven by passive reactions to institutional herding, by systematic changes in risk-aversion, or by taxes. Psychological biases likely contribute to the correlated trading of individuals. These biases lead investors to systematically buy stocks with strong recent performance, to refrain from selling stocks held for a loss, and to be net buyers of stocks with unusually high trading volume.

Keywords: Individual; investors; Market; efficiency; Herding (search for similar items in EconPapers)
Date: 2009
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