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Many financial economists believe that the random walk model is a good description of the logarithm of stock prices. It implies that the percentage changes
Many financial economists believe that the random walk model is a good description of the logarithm of stock prices. It implies that the percentage changes in stock prices are unforecastable. A financial analyst claims to have a new model that makes better predictions than the random walk model. Explain how you would examine the analysts claim that his model is superior.
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