The Evolution of Financial Market Efficiency: Evidence from Earnings Announcements

37 Pages Posted: 6 Feb 2018 Last revised: 2 Feb 2019

Date Written: January 31, 2019

Abstract

Stock prices on earnings announcement days have become more efficient. Prices better reflect earnings surprises, and post-announcement price drifts gradually disappear over time. Since the turn of the century, prices on announcement days have also become more informative about future prices with announcement day returns explaining more than 20% of total quarter-ahead returns. This increase in price informativeness corresponds to the sudden rise in earnings guidance practices and more transparent earnings disclosures on announcement days. These results hold for large and small stocks and have broad implications for firm managers relying on markets to produce price information.

Keywords: disclosure, earnings announcements, market efficiency, price discovery, price informativeness

JEL Classification: G10, G12, G14

Suggested Citation

Martineau, Charles, The Evolution of Financial Market Efficiency: Evidence from Earnings Announcements (January 31, 2019). Available at SSRN: https://ssrn.com/abstract=3111607 or http://dx.doi.org/10.2139/ssrn.3111607

Charles Martineau (Contact Author)

University of Toronto ( email )

105 St-George
Toronto, Ontario M5S3E6
Canada

HOME PAGE: http://charlesmartineau.com

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