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Team Disposition Effects: Vanity or Groupthink?
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Team Disposition Effects: Vanity or Groupthink?

Daniel Dorn
SSRN Electronic Journal
2022
url
https://doi.org/10.2139/ssrn.4057531View
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Abstract

Team-managed mutual funds exhibit a disposition effect: they are reluctant to sell losers relative to winners. This propensity is costly as winners sold outperform losers held by 56bp during the next quarter relative to stocks with similar size, book-to-market, and momentum characteristics. Disposition effects are strongest when positions are initiated by a subset of the team who thus bears special responsibility. Disposition behavior is weaker in positions initiated by all team members. Our results suggest that team disposition effects are primarily due to the difficulty of admitting mistakes to peers (vanity); conformity to in-group pressures (groupthink) plays a lesser role

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