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Firm size, information acquisition and price efficiency


  • Tian Zhao


We present a model in a competitive market where traders choose between a small and a large firm to acquire costly private information, but they also obtain free public information by observing equilibrium share prices. Our major finding is the existence of a noisy rational expectation competitive equilibrium, in which there are more informed traders of the large firm than those of the small firm. As a result, share prices of the large firm are more informative than those of the small firm. Our empirical study supports the analytical results. By using a bivariate vector autoregressive regression, we are able to conduct a variance decomposition of share prices for different size portfolios. We find that prices of large-size portfolios are more informative because non-value-related price shocks are less important in driving price changes of large-size portfolios than in the case of small-size portfolios.

Suggested Citation

  • Tian Zhao, 2012. "Firm size, information acquisition and price efficiency," Quantitative Finance, Taylor & Francis Journals, vol. 12(10), pages 1599-1614, October.
  • Handle: RePEc:taf:quantf:v:12:y:2012:i:10:p:1599-1614
    DOI: 10.1080/14697688.2011.565364

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    Cited by:

    1. Yang, Ann Shawing & Pangastuti, Airin, 2016. "Stock market efficiency and liquidity: The Indonesia Stock Exchange merger," Research in International Business and Finance, Elsevier, vol. 36(C), pages 28-40.

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