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Index Investing and Asset Pricing under Information Asymmetry and Ambiguity Aversion

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  • David Hirshleifer
  • Chong Huang
  • Siew Hong Teoh

Abstract

In a setting with information asymmetry and a tradable value-weighted market index, ambiguity averse investors hold undiversified portfolios, and assets have nonzero alphas. But when a passive fund offers the risk-adjusted market portfolio (RAMP), whose weights depend on information precisions as well as market values, all investors hold the same portfolios as in the economy without model uncertainty and thus engage in index investing. So RAMP improves participation and risk sharing. Asset alphas are zero with RAMP as pricing portfolio. RAMP can be implemented by a fund of funds even if no manager individually has sufficient knowledge to do so.

Suggested Citation

  • David Hirshleifer & Chong Huang & Siew Hong Teoh, 2017. "Index Investing and Asset Pricing under Information Asymmetry and Ambiguity Aversion," NBER Working Papers 24143, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:24143
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    More about this item

    JEL classification:

    • F3 - International Economics - - International Finance
    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading
    • G15 - Financial Economics - - General Financial Markets - - - International Financial Markets
    • G4 - Financial Economics - - Behavioral Finance
    • G41 - Financial Economics - - Behavioral Finance - - - Role and Effects of Psychological, Emotional, Social, and Cognitive Factors on Decision Making in Financial Markets

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