FINE 3200 Lecture Notes - Lecture 6: Business Cycle, Pure Luck, Abnormal Return
Document Summary
This is the definition of an efficient market. c. the p/e ratio is public information and should not be predictive of abnormal security returns. Magna"s continuing high return on assets does not imply that stock market investors who purchased magna shares after its success already was evident would have earned a high return on their investments. The question for market efficiency is whether investors can earn abnormal risk- adjusted profits. If the stock price run-up occurs when only insiders are aware of the coming dividend increase, then it is a violation of strong-form, but not semi- strong form efficiency. If the public already knows of the increase, then it is a violation of semi-strong form efficiency. While positive beta stocks will respond well to favourable new information about the economy"s progress through the business cycle, they should not show abnormal returns around already anticipated events. If a recovery, for example, already is anticipated, the actual recovery is not news.