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Information Markets and the Comovement of Asset Prices

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Author Info
LAURA L. VELDKAMP

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Abstract

Traditional asset pricing models predict that covariance between prices of different assets should be lower than what we observe in the data. This paper introduces markets for information that generate high price covariance within a rational expectations framework. When information is costly, rational investors only buy information about a subset of the assets. Because information production has high fixed costs, competitive producers charge more for low-demand information than for high-demand information. The low price of high-demand information makes investors want to purchase the same information that others are purchasing. When investors price assets using a common subset of information, news about one asset affects the other assets' prices; asset prices comove. The cross-sectional and time-series properties of comovement are consistent with this explanation. Copyright 2006 The Review of Economic Studies Limited.

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File URL: http://www.blackwell-synergy.com/doi/abs/10.1111/j.1467-937X.2006.00397.x
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Publisher Info
Article provided by Blackwell Publishing in its journal Review of Economic Studies.

Volume (Year): 73 (2006)
Issue (Month): 3 (07)
Pages: 823-845
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Handle: RePEc:bla:restud:v:73:y:2006:i:3:p:823-845

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References listed on IDEAS
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. Harrison Hong & Jeremy C. Stein, 2003. "Simple Forecasts and Paradigm Shifts," NBER Working Papers 10013, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  2. Rui Albuquerque & Gregory H. Bauer & Martin Schneider, 2005. "International equity flows and returns: a quantitative equilibrium approach," International Finance 0508006, EconWPA. [Downloadable!]
    Other versions:
  3. Geore-Marios Angeletos & Alessandro Pavan, 2004. "Transparency of Information and Coordination in Economies with Investment Complementarities," Levine's Bibliography 122247000000000289, UCLA Department of Economics. [Downloadable!]
    Other versions:
  4. King, Mervyn A & Wadhwani, Sushil, 1990. "Transmission of Volatility between Stock Markets," Review of Financial Studies, Oxford University Press for Society for Financial Studies, vol. 3(1), pages 5-33. [Downloadable!] (restricted)
    Other versions:
  5. Morris, Stephen & Shin, Hyun Song, 1998. "Unique Equilibrium in a Model of Self-Fulfilling Currency Attacks," American Economic Review, American Economic Association, vol. 88(3), pages 587-97, June. [Downloadable!] (restricted)
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  6. John Y. Campbell, 2001. "Have Individual Stocks Become More Volatile? An Empirical Exploration of Idiosyncratic Risk," Journal of Finance, American Finance Association, vol. 56(1), pages 1-43, 02. [Downloadable!] (restricted)
    Other versions:
  7. Nicholas Barberis & Andrei Shleifer & Jeffrey Wurgler, 2002. "Comovement," Harvard Institute of Economic Research Working Papers 1953, Harvard - Institute of Economic Research. [Downloadable!]
    Other versions:
    • Nicholas Barberis & Andrei Shleifer & Jeffrey Wurgler, 2002. "Comovement," NBER Working Papers 8895, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
    • Barberis, Nicholas & Shleifer, Andrei & Wurgler, Jeffrey, 2005. "Comovement," Journal of Financial Economics, Elsevier, vol. 75(2), pages 283-317, February. [Downloadable!] (restricted)
  8. Laura E. Kodres & Matthew Pritsker, 2002. "A Rational Expectations Model of Financial Contagion," Journal of Finance, American Finance Association, vol. 57(2), pages 769-799, 04. [Downloadable!] (restricted)
  9. Sanford J. Grossman & Joseph E. Stiglitz, 1980. "On the Impossibility of Informationally Efficient Markets," NBER Reprints 0121, National Bureau of Economic Research, Inc.
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  10. Shiller, Robert J, 1989. " Comovements in Stock Prices and Comovements in Dividends," Journal of Finance, American Finance Association, vol. 44(3), pages 719-29, July. [Downloadable!] (restricted)
  11. Laura Veldkamp, 2004. "Media Frenzies in Markets for Financial Information," Econometric Society 2004 North American Winter Meetings 4, Econometric Society. [Downloadable!]
    Other versions:
  12. Harrison Hong & Jeremy C. Stein, 2003. "Simple Forecasts and Paradigm Shifts," Harvard Institute of Economic Research Working Papers 2007, Harvard - Institute of Economic Research. [Downloadable!]
  13. Admati, Anat R, 1985. "A Noisy Rational Expectations Equilibrium for Multi-asset Securities Markets," Econometrica, Econometric Society, vol. 53(3), pages 629-57, May. [Downloadable!] (restricted)
  14. Albert S. Kyle, 2001. "Contagion as a Wealth Effect," Journal of Finance, American Finance Association, vol. 56(4), pages 1401-1440, 08. [Downloadable!] (restricted)
  15. Robert J. Shiller, 1989. "Comovements in Stock Prices and Comovements in Dividends," NBER Working Papers 2846, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  16. Pindyck, Robert S & Rotemberg, Julio J, 1993. "The Comovement of Stock Prices," The Quarterly Journal of Economics, MIT Press, vol. 108(4), pages 1073-1104, November. [Downloadable!] (restricted)
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Cited by:
(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. Yuriy Gorodnichenko, 2008. "Endogenous information, menu costs and inflation persistence," NBER Working Papers 14184, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  2. Guido Lorenzoni, 2006. "A Theory of Demand Shocks," NBER Working Papers 12477, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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