One weakness of the product lifecycle concept is that it in no way predicts the length of each phase, and nor can it be used to forecast sales with any accuracy.
Another is that the model can be self-fulfilling: If a marketer decides that a product is approaching its Decline phase, and so stops actively marketing it, the product's sales will almost inevitably decline. This might not have happened had it been managed as if it was still in its Maturity phase.
Furthermore, it's possible that by improving a product aggressively on an ongoing basis, growth can continue for a long time.
Successful marketers need to draw on a wide range of data and analysis to help them decide which phase a product is in, and whether that phase can be extended. And while this model is useful and thought-provoking, they need to base their decisions on a good understanding of the facts.
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