Use product life cycle and portfolio analysis
Use life-cycle stages and the Boston Matrix as decision aids, then qualify their limits and implications for a product portfolio.
Section 3.3 · The marketing mix
Cambridge International AS & A Level Business 9609, 2026–2028 syllabus and 2029 syllabus, section 3.3.3. Cambridge states that the 2029 syllabus has no significant changes affecting teaching. This lesson maps only its named section; other sections and full paper practice remain separate. Written practice is self-checked
Before you begin
- No previous business course is assumed. Use the lesson's definitions before applying them to the business context.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which Boston Matrix category combines high relative share with low market growth?
What you will learn
- Describe product life-cycle stages and extension strategies
- Classify products with the Boston Matrix
- Use portfolio analysis to inform marketing decisions
Life-cycle patterns can guide, not dictate, decisions
The product life cycle describes possible patterns in sales as a product moves through introduction, growth, maturity and decline. Promotion, distribution, pricing and development needs may change across stages.
Extension strategies aim to renew interest or use, for example adapting features, finding a new segment or changing promotion. They may delay decline but require investment and do not guarantee renewed demand. Actual sales can differ from a typical curve.
The Boston Matrix compares share and market growth
The matrix classifies products as stars (high share, high market growth), cash cows (high share, low growth), question marks (low share, high growth) or dogs (low share, low growth). It can prompt discussion of investment, cash generation and portfolio balance.
Classification depends on clear relative-share and market-growth data. A label is not a strategy by itself: a low-share product may be worth keeping for strategic reasons, and a high-share product may still be unprofitable. Review costs, synergies, customer value and market outlook.
Pause and explain
What is a limitation of the Boston Matrix?
Worked example
A firm's product has high relative market share in a fast-growing market. Classify it and explain one possible decision.
Show the worked solution
- High share plus high market growth matches the star category.
- Growth may create an opportunity and need for investment.
- Check cash needs, profitability and competition before investing.
Answer It is a star in the Boston Matrix. The business may invest to defend its position or expand capacity, but should examine cash requirements, unit economics and competitor action rather than assuming a star automatically generates surplus cash.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A mature product's sales have levelled off. Suggest one extension strategy and evidence needed before investing.
Give me a hint
Target a new use or improve the offer, then test customer response and cost.
Compare my reasoning
- Choose a specific feature, segment or promotion change.
- Estimate development and launch costs.
- Pilot and compare incremental sales or contribution with the current path.
The firm could adapt the product for a new segment or add a valued feature. It should estimate development cost, test the concept with target buyers and compare incremental contribution with a no-change forecast before scaling.
Look for these in your work
- Strategy is concrete
- Investment cost is recognised
- Evidence compares against a baseline
A product has low share in a growing market but supports sales of the firm's main product. Explain why the label 'question mark' does not settle whether to withdraw it.
Give me a hint
Consider portfolio relationships and strategic contribution beyond its standalone share.
Compare my reasoning
- The label describes relative share and market growth.
- The product may attract customers or enable bundles for the main offer.
- Compare those benefits with its own and linked costs.
It fits the question-mark category, but it may support the main product through bundles, customer acquisition or complementary use. The firm should value these links and compare them with direct and opportunity costs before deciding to invest, reposition or withdraw.
Look for these in your work
- Classification is accurate
- Strategic link is explained
- Costs and benefits are compared
A business wants to use life-cycle analysis to cut promotion spending on a product said to be in decline. Evaluate what evidence should inform that decision.
Give me a hint
Check whether sales are truly declining and whether promotion could change the path.
Compare my reasoning
- Compare sales over several periods and relevant segments.
- Consider seasonality, competitor changes and distribution availability.
- Estimate promotion's incremental contribution and strategic role.
Managers should verify the sales trend over time and by segment, accounting for seasonality or distribution changes. They should estimate whether promotion could generate incremental contribution and consider the product's role in the portfolio; a life-cycle label alone is insufficient.
Look for these in your work
- Trend evidence is checked
- Alternative explanations are considered
- Decision includes costs and portfolio context
Common mistakes
- Treating life-cycle stages as a fixed timetable
- Assuming every cash cow should fund every star
- Using matrix labels without current market data or strategic context
What can you explain now?
Which Boston Matrix category combines high relative share with low market growth?
Compare with the explanation
Cash cow
A cash cow has strong relative share in a slower-growth market.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
What do the product life cycle and Boston Matrix help managers discuss, and what can neither decide on its own?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.