Product life cycle

The product life cycle is a planning metaphor: products and categories may move from development and launch through growth, maturity and decline. The model helps a company ask how customer adoption, competition, economics and communication should change over time. It does not predict an inevitable biological death.

When to use it

• Develop a long-term product and portfolio strategy.
• Challenge whether marketing, investment and operations fit observed market conditions.
• Consider launch, scaling, rejuvenation, harvesting or exit.
• Apply the model in the business situations described here.

Origins

Early 1900s sociologists applied biological life-cycle ideas to industrial products, and economists in the 1920s and 1930s described growth curves in markets such as automobiles. In 1933 advertising practitioner Otto Kleppner distinguished pioneering, competitive and retentive phases. Joel Dean’s 1950 Harvard Business Review work on pricing new products is an early explicit business use of the product-life-cycle idea. Booz Allen Hamilton described the cycle in a 1960 paper, and Theodore Levitt popularised its managerial use in 1965.

Raymond Vernon’s 1966 international product-cycle theory examined how production and trade can shift as an innovation matures—for example, from initial creation and consumption in the United States to export and later overseas production. That 1966 article is important, but it did not originate every form of the marketing life-cycle concept.

What it is

The stages are hypotheses about demand and competitive evolution. Define whether the object is one model, a brand, a product category or an enabling technology; each can occupy a different stage at the same time.

Pre-birth

An idea is explored, tested and developed before launch. It may fail because the customer problem is weak, the solution is inferior, economics are unattractive, capabilities are missing or access to the market is blocked.

The often-repeated claim that 95 per cent of new products fail is associated with Clay Christensen but lacks a consistent definition and denominator. Estimates that 30–50 per cent of launched products fail also vary by industry, period and what “failure” means. Use cohort evidence from a comparable context rather than these figures as a forecast.

Youth

Introduction requires customer learning, distribution, operational readiness and awareness. Sales may be slow, unit costs high and losses likely. Innovators and early adopters can provide evidence, but moving to a broader market requires a proposition that works beyond enthusiasts; see Diffusion of innovation.

Time in the stage varies. Some toys and digital offers move quickly, while regulated or infrastructure-dependent products may take years. Measure adoption, repeat use, customer outcome and unit economics rather than age alone.

Growth

Demand accelerates, awareness spreads and competitors enter. Greater scale can lower cost and improve availability, while new rivals may expand category awareness. Price pressure and execution risk increase. The appropriate response may include capacity, distribution, brand investment, quality control and product improvement.

Maturity

Growth slows as adoption broadens or the market approaches saturation. Rivalry can intensify, consolidation may occur and suppliers seek efficiency, segmentation, differentiation and extensions. A mature product can remain highly profitable, but “cash cow” assumptions must be tested against reinvestment, service and renewal needs.

Old age

Demand may decline because customer needs change, substitutes improve, regulation shifts or the category saturates. Falling volume and continuing price pressure can reduce profit. Options include serving a defensible niche, simplifying, harvesting, migrating customers, rejuvenating the offer or exiting responsibly.

Do not force decline merely because the curve suggests it. Investigate whether the problem is the category, one brand, a channel, weak execution or temporary conditions.

Product

Product rejuvenation can add relevant features, uses, formats, segments or business models. It should solve a current need rather than decorate a declining offer.

Sales

The familiar curve shows sales rising through introduction and growth, flattening in maturity and falling in decline. Real trajectories can pause, repeat, branch or recover; revenue, units, adoption and profit may follow different curves.

Time

Marketing objectives often move from learning and trial to share, loyalty, usage and efficient retention. Distribution, service, production and communication must change with them. Time itself does not determine the stage; evidence does.

Create classic

The inherited figure associates early phases with awareness, trial and personal selling; growth with distribution, brand preference and media; maturity with frequency, extensions and promotions; and decline with reduced expenditure, niches or exit.

Use these as questions, not prescriptions. A “classic” product may remain relevant for generations, and a young product may need little mass promotion.

Developments of the model

Durations vary radically. A toy can move from launch to decline in less than 12 months; electronics may change in a few years; a car model often has a multi-year cycle; steel, cement and bricks persist far longer.

The transition from maturity to decline is especially ambiguous. In the later 20th century, glass could have appeared mature, yet architecture and design created new applications. Wheels, hammers and nails continue because the underlying jobs remain. The model is therefore better for organising scenarios than locating a product at a precise point.

How to use it

The following Nutri-Grain account is a historical case. Kellogg launched the breakfast bar in 1997 as a healthier snack for people who missed breakfast. The product reportedly approached a 50 per cent cereal-bar share, then grew with promotion until 2002 while repositioning toward an all-day snack.

By 2004, seven years after launch, Nutri-Grain sales were declining even though the category reportedly grew at 15 per cent annually. Research suggested a diluted message and competition from other Kellogg products. The company developed a soft-baked bar, repositioned it around taste and health for mid-morning use, and launched Elevenses in 2005.

The account says the relaunch reversed decline and increased sales by almost 50 per cent. “Two decades later” is a dated observation from the inherited case, not a current assessment. Verify the market-share, growth and sales claims before using them as evidence.

For a live application, plot units, revenue, penetration, repeat purchase, margin, competitors, customer needs and substitutes. Compare explanations for the pattern. Create stage-specific options, forecast their economics and run experiments where possible. Make portfolio choices from evidence and strategic fit, not the age of the product.

Some things to think about

• Knowing whether demand is topping out matters, but stage assignment should follow analysis. Test whether rejuvenation changes the customer outcome and economics.

• Communication should evolve with customer knowledge and the competitive task; it should not change simply because a calendar says the product is older.

Top practical tip

Define the object and diagnose the curve with adoption, demand, competition and economics. Develop several trajectories—including rejuvenation—before choosing investment or exit.

Top pitfall

The life cycle is conceptual, not a clock. Labelling a product “declining” can become self-fulfilling if the organisation withdraws support before testing other explanations.

Further reading

• Levitt, T. (nineteen sixty-five). “Exploit the Product Life Cycle.” Harvard Business Review.
• Vernon, R. (nineteen sixty-six). “International Investment and International Trade in the Product Cycle.” Quarterly Journal of Economics.