Product Life Cycle & Boston Matrix
Products Have a Life Cycle
Every product goes through stages over time — it is born, grows, peaks and eventually declines. The product life cycle (PLC) is the model businesses use to track this journey and decide what to do at each stage. Understanding it stops a business pumping money into a declining product or charging too little for one that is about to take off.
The Five Stages
Research & development (R&D) — the product is being designed and tested. Costs are high; revenue is zero. Dyson famously spent years developing the cyclone vacuum before the first one was sold.
Introduction — the product launches. Sales grow slowly as customers hear about it. Price may be set high (skimming) or low (penetration). Adverts are heavy. The business is often still making a loss on this product.
Growth — sales rise quickly as word spreads and rivals take notice. Profits turn positive as fixed development costs get spread over more units.
Maturity — sales peak and flatten. The market is saturated, competition is fierce, and prices may need to fall. The iPhone has been in maturity for several years — annual refreshes keep sales steady rather than booming.
Decline — sales fall as customers move to newer products. Nokia’s 2000s dominance in mobile phones collapsed into decline once Apple and Samsung launched smartphones.
The five stages of the product life cycle in order are: research & development, introduction, growth, maturity and decline. Learn what happens to sales and profit at each stage, and be ready to read the stages off a life-cycle graph.
Extension Strategies
Extension strategies are how businesses push back the decline stage. The specification lists five: updating packaging, adding more or different features, changing the target market, advertising and price reduction. Cadbury’s Dairy Milk — in the UK market since 1905 — has survived through constant extension: Fruit & Nut, Whole Nut, Caramel, Oreo, Marvellous Creations, vegan plant-based versions, limited-edition flavours, new packaging designs. Each launch refreshes the brand.
Not every strategy suits every product. A simple price reduction may boost sales short-term but trains customers to expect cheaper prices. Adding features can backfire if the product becomes too complicated. Extension works best when it gives customers a genuine new reason to buy.
The Product Portfolio and the Boston Matrix
Most businesses sell more than one product. Their product portfolio is the full set. A healthy portfolio has products at different life cycle stages — so that as one declines, a younger one is rising to take its place.
The Boston Matrix (also called the Boston Box) helps a business see this balance. It plots each product against two things: market growth rate on the vertical axis, and market share (relative to the biggest rival) on the horizontal axis. This creates four categories.
Stars — high growth, high share. Fast-growing market and the business is winning it. Needs cash to stay on top, but will become a cash cow later. Electric vehicles for Tesla.
Cash cows — low growth, high share. The market has matured but the business still dominates. Generates steady profits that can fund Stars and Question Marks. Cadbury Dairy Milk chocolate bars.
Question marks — high growth, low share. Fast market but the business has a small slice. Could become a Star with investment, or flop. Risky — needs a decision.
Dogs — low growth, low share. Slow market and the business is losing. Usually withdrawn or sold. Nokia feature phones after the smartphone takeover.
The Boston Matrix axes are market growth rate (vertical) and market share (horizontal). The vertical axis is NOT how fast the product itself is growing — it is how fast the whole market is growing. It is an easy mistake to make.
What Do You Do With Each Category?
The Boston Matrix is useful because each category suggests an action. Stars need reinvested cash — the aim is to protect market share as the market grows. Tesla pours money into new Gigafactories to keep its Star position in electric vehicles. Cash Cows are milked — keep them steady with small refreshes, and use the profit to fund riskier products elsewhere. Cadbury Dairy Milk subsidises Mondelez’s newer experimental brands.
Question Marks need a decision: invest heavily to turn them into Stars, or pull the plug. Netflix’s early gaming push was a Question Mark — fast-growing market, low Netflix share — and the firm decided to invest. Dogs are usually withdrawn, sold or quietly wound down because they no longer pay their way. Cadbury discontinued Wispa in 2003 when it looked like a Dog, then relaunched it in 2008 after fan campaigns revived demand.
The Boston Matrix has limits too. It only uses two axes, so it ignores things like profit margin, brand value and how strategic a product is. A small but iconic product (like Rolls-Royce’s flagship Phantom) might look like a Dog on paper but is crucial for the brand’s image.