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Investor Inattention and the Market Impact of Summary Statistics

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  • Thomas Gilbert
  • Shimon Kogan
  • Lars Lochstoer
  • Ataman Ozyildirim

Abstract

Investors with limited attention have an incentive to focus on summary statistics rather than individual pieces of information. We use this observation to form a test of the impact of limited attention on the aggregate stock market. We examine the market response to a macroeconomic release that is purely a summary statistic, the U.S. Leading Economic Index (LEI). Consistent with the limited attention hypothesis, we show that the LEI announcement has an impact on aggregate stock returns, return volatility, and trading volume. Furthermore, we find evidence that the response to the LEI is higher for stocks which inattentive investors are more likely to trade.

Suggested Citation

  • Thomas Gilbert & Shimon Kogan & Lars Lochstoer & Ataman Ozyildirim, 2007. "Investor Inattention and the Market Impact of Summary Statistics," GSIA Working Papers 2006-E24, Carnegie Mellon University, Tepper School of Business.
    • Handle: RePEc:cmu:gsiawp:197052381
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