John Right, an analyst with Stock Pickers Inc, claims: "It is not worth my time to develop detailed forecasts of sales growth, profit margins, et cetera, to make earnings projections. I can be almost as accurate, at virtually no cost, using the random walk model to forecast earnings.". What is the random walk model? Do you agree or disagree with John Right's forecast strategy? Why or why not?


We don't agree with John. According to the random walk model, the forecast for year t + 1 is simply the amount observed for year t. The random walk model only describes the average firm's behavior. Random walk model may not be applicable to those firms that erect barriers to competition and protect margins for extended periods. The art of financial statement analysis requires knowing not only what the "normal" patterns are but also how to identify those firms that will not follow the norm. This can only be done if the analyst performs a strategy analysis.

Business

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