Using the Product Life Cycle
The product life cycle can be a useful tool in planning for the life of the product, but it has a number of limitations.
Not all products follow a smooth and predictable growth path. Some products are tied to specific business cycles or have seasonal factors that impact growth. For example, enrollment in higher education tracks closely with economic trends. When there is an economic downturn, more people lose jobs and enroll in college to improve their job prospects. When the economy improves and more people are fully employed, college enrollments drop. This does not necessarily mean that education is in decline, only that it is in a down cycle.
Furthermore, evidence suggests that the PLC framework holds true for industry segments but not necessarily for individual brands or projects, which are likely to experience greater variability.[1]
Of course, changes in other elements of the marketing mix can also affect the performance of the product during its life cycle. Change in the competitive situation during each of these stages may have a much greater impact on the marketing approach than the PLC itself. An effective promotional program or a dramatic lowering of price may improve the sales picture in the decline period, at least temporarily. Usually the improvements brought about by non-product tactics are relatively short-lived, and basic alterations to product offerings provide longer benefits.
Whether one accepts the S-shaped curve as a valid sales pattern or as a pattern that holds only for some products (but not for others), the PLC concept can still be very useful. It offers a framework for dealing systematically with product marketing issues and activities. The marketer needs to be aware of the generalizations that apply to a given product as it moves through the various stages.