This is not a great

This is not a great explanation.

Share prices are said to follow a random walk because no piece of information that you possess now can be used to predict changes in value in the future.

Why not? Because as soon as any information about the share becomes known, including forecasts of expected future profits for example, it is immediately priced into the share now. That's why you shouldn't just buy shares in a company because it is a great company. The market already knows it is a great company and has already priced this into the share price, meaning there is no reason to expect the price to go up further in the future.

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