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Inexperienced Investors and Bubbles

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Author Info
Robin Greenwood
Stefan Nagel

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Abstract

We use mutual fund manager data from the technology bubble to examine the hypothesis that inexperienced investors play a role in the formation of asset price bubbles. Using age as a proxy for managers' investment experience, we find that around the peak of the technology bubble, mutual funds run by younger managers are more heavily invested in technology stocks, relative to their style benchmarks, than their older colleagues. Furthermore, young managers, but not old managers, exhibit trend-chasing behavior in their technology stock investments. As a result, young managers increase their technology holdings during the run-up, and decrease them during the downturn. Both results are in line with the behavior of inexperienced investors in experimental asset markets. The economic significance of young managers' actions is amplified by large inflows into their funds prior to the peak in technology stock prices.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 14111.

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Date of creation: Jun 2008
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Handle: RePEc:nbr:nberwo:14111

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G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions

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(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Giuliano, Paola & Spilimbergo, Antonio, 2009. "Growing Up in a Recession: Beliefs and the Macroeconomy," IZA Discussion Papers 4365, Institute for the Study of Labor (IZA). [Downloadable!]
    Other versions:
  2. Malcolm Baker & Jeffrey Wurgler, 2007. "Investor Sentiment in the Stock Market," NBER Working Papers 13189, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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  3. Menkhoff, Lukas & Schmeling, Maik & Schmidt, Ulrich, 2008. "Are all professional investors sophisticated?," Diskussionspapiere der Wirtschaftswissenschaftlichen Fakultät der Universität Hannover dp-397, Universität Hannover, Wirtschaftswissenschaftliche Fakultät. [Downloadable!]
  4. Ulrike Malmendier & Stefan Nagel, 2009. "Depression Babies: Do Macroeconomic Experiences Affect Risk-Taking?," NBER Working Papers 14813, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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