Why is the fact that stock prices follow a random walk


Problem

Why is the fact that stock prices follow a random walk a signal of stock market efficiency? What would have to be true if stock prices did not follow a random walk?

The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.

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Macroeconomics: Why is the fact that stock prices follow a random walk
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