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Tammy analyzes the history of trading volume on the stock of company XYZ. She believes she finds a pattern which will predict an increase in the stock price of XYZ. Tammy plans to make trades using her strategy to make a profit. Tammy:
A. believes in the strong form of the efficient market hypothesis
B. believes in the weak form of the efficient market hypothesis
C. believes in the semistrong form of the efficient market hypothesis
D. does not believe in any form of the efficient market hypothesis
Answer: D. By thinking she can profit on information she discovered by examining the historical trading volume of XYZ stock, Tammy does not believe in any form of the efficient market hypothesis (EMH), which in general asserts that all available information is already reflected in a stock’s price. The weak form of the EMH asserts that a stock’s price already reflects all information that can be derived from market trading data, such as historical trading volume. The semistrong form asserts that all market trading data and all other publicly available information on the company, such as earnings reports, is reflected in a stock’s price. The strong form asserts all historical data and all company information – both publicly available and privately known only to insiders- is reflected in a stock’s price.