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Journal Article
Information, Trading, and Volatility
2019
Overview
What moves stock prices? Prior literature concludes that the revelation of private information through trading, and not public news, is the primary driver. We revisit the question by using textual analysis to identify fundamental information in news. We find that this information accounts for 49.6% of overnight idiosyncratic volatility (vs. 12.4% during trading hours), with a considerable fraction due to days with multiple news types. We use our measure of public information arrival to reinvestigate two important contributions in the literature related to individual R² s of stock returns on aggregate factors.
Publisher
Oxford University Press,Oxford Publishing Limited (England)
Subject
