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Chapter 9. The Efficient Market Hypothesis. Efficient Market Hypothesis (EMH). Do security prices reflect information ? Why look at market efficiency. Random Walk and the EMH. Random Walk - stock prices are random. Random Walk with Positive Trend. Security Prices. Time.
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Chapter9 The Efficient Market Hypothesis
Efficient Market Hypothesis (EMH) • Do security prices reflect information ? • Why look at market efficiency
Random Walk and the EMH • Random Walk - stock prices are random
Random Walk with Positive Trend Security Prices Time
Random Price Changes • Why are price changes random?
Forms of the EMH • Weak • Semi-strong • Strong
Types of Stock Analysis • Technical Analysis – • Fundamental Analysis -
How Tests Are Structured 1. Examine prices and returns over time
Returns Surrounding the Event -t 0 +t
How Tests Are Structured (cont.) 2. Returns are adjusted to determine if they are abnormal -t 0 +t