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Returns to Informational Advantages: The Case of Analysts' Forecast Revisions

A. Rashad Abdel-Khalik and Bipin B. Ajinkya
The Accounting Review
Vol. 57, No. 4 (Oct., 1982), pp. 661-680
Stable URL: http://www.jstor.org/stable/247405
Page Count: 20
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Returns to Informational Advantages: The Case of Analysts' Forecast Revisions
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Abstract

This paper evaluates whether the primary and secondary dissemination of earnings forecast revisions by security analysts is reflected in security prices. Security prices were used to determine the profitability (before the cost of search) of trading strategies based on the nonpublic knowledge of forecast revisions. For a sample of 288 weekly earnings forecast revisions, the results were consistent with the hypothesis that early knowledge of forecast revisions could be used to form profitable trading strategies. Furthermore, the secondary dissemination of forecasts continued to have information content at the point of disclosure. These results are inconsistent with the strong form, but consistent with the semi-strong form, of market efficiency. Furthermore, the information contemporaneously available from public sources did not generate equivalently profitable trading rules, indicating that forecast revisions were not deducible from other publicly available information. Finally, some general public policy implications concerning mandatory disclosure of forecasts were drawn.

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