What Are the Stages of the Product Life Cycle?

The four main stages of the product life cycle are introduction, growth, maturity and decline. The cycle describes how a product’s sales typically change over time after it is launched.

The stages

1. Introduction: The product enters the market. Sales are usually low while customers become aware of it. The business may spend heavily on promotion, and profit may be low or negative.
2. Growth: Sales rise as more customers buy the product. Profit often increases, although competitors may enter the market.
3. Maturity: Sales reach a high level and growth slows or levels off. Competition can be strong, so the business may focus on keeping customers and protecting its market share.
4. Decline: Sales fall as customer preferences change or newer products replace the product. The business might reduce costs, change the product or withdraw it.

Imagine a new drinks brand. It sells slowly at launch, gains customers as more shops stock it, reaches a period of steady sales, then loses sales when customers switch to other drinks. That pattern illustrates the four stages, but real products do not always move through them at the same speed.

A product life cycle is a model, not a guaranteed timetable. Some diagrams also show development before introduction: this is when the product is being created, before it goes on sale. An extension strategy, such as changing the packaging or finding a new market, is an action a business takes to try to maintain sales; it is not one of the four main stages.

Common exam mistake: Do not assume sales and profit follow the same pattern. Sales can be rising during growth while profit is still affected by substantial marketing costs. When using the model, explain what is happening to sales and link your suggested business decision to the product’s stage.