FIN 300 Lecture Notes - Lecture 11: Dow Jones Industrial Average, Efficient-Market Hypothesis, Dividend Yield

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Security prices change without predictable trends or patterns. Stock prices seem to go up or down on any particular day, regardless of what has occurred on previous days. Therefore, one can"t use past patterns to predict future price changes. Random walk is proof of market efficiency. Since all information is rapidly incorporated into the price of the stock, all stocks are correctly priced and no investor or issuer can earn excess returns. Weak form: market prices reflect all information contained in past market prices. Semi-strong form: market prices reflect all publicly available information. Strong form: market prices reflect all known information. Paradox of technical analysis: let"s say that technical analysts spot the upward trend in a stock"s price. Results: as soon as a price trend becomes apparent to technical analysts, they immediately eliminate it by trading, this means no one can consistently forecast the future from past price activity.

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