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Bubbles for Fama

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  • Robin Greenwood
  • Andrei Shleifer
  • Yang You

Abstract

We evaluate Eugene Fama’s claim that stock prices do not exhibit price bubbles. Based on US industry returns 1926-2014 and international sector returns 1985-2014, we present four findings: (1) Fama is correct in that a sharp price increase of an industry portfolio does not, on average, predict unusually low returns going forward; (2) such sharp price increases predict a substantially heightened probability of a crash; (3) attributes of the price run-up, including volatility, turnover, issuance, and the price path of the run-up can all help forecast an eventual crash and future returns; and (4) some of these characteristics can help investors earn superior returns by timing the bubble. Results hold similarly in US and international samples.

Suggested Citation

  • Robin Greenwood & Andrei Shleifer & Yang You, 2017. "Bubbles for Fama," NBER Working Papers 23191, National Bureau of Economic Research, Inc.
  • Handle: RePEc:nbr:nberwo:23191
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    References listed on IDEAS

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    Cited by:

    1. Daniel Andrei & Bruce I. Carlin, 2017. "Asset Pricing in the Quest for the New El Dorado," NBER Working Papers 23455, National Bureau of Economic Research, Inc.

    More about this item

    JEL classification:

    • G02 - Financial Economics - - General - - - Behavioral Finance: Underlying Principles
    • G1 - Financial Economics - - General Financial Markets
    • 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

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