Financial Management and Strategic Management · Strategic Analysis: External Environment

Product Life Cycle, Experience Curve and Industry Evolution

Updated 4 October 2026 · Fact-checked

The product life cycle describes sales and profit across four stages: introduction, growth, maturity and decline. The experience curve says unit cost falls as cumulative output rises. Together they show how an industry evolves. To answer, name the stage, state its features, then link a matching strategy.

Understand Product Life Cycle, Experience Curve and Industry Evolution

Every product, and the industry that sells it, changes over time. The product life cycle (PLC) is a model of that change. It follows a product's sales volume and profit through four stages: introduction, growth, maturity and decline. Strategy that suits one stage can fail in the next.

In introduction, sales are low, costs are high and profits are usually negative. Customers are unaware and distribution is limited. The firm spends on awareness and on building demand. In growth, sales rise fast, profits appear, and new competitors enter. In maturity, growth slows, competition is intense, prices come under pressure and weaker firms leave. In decline, sales and profits fall because of new technology or changed tastes. Some firms exit, some harvest, and some stay as niche players.

The experience curve is a different idea. It says that as a firm produces more over time (cumulative volume, not just in one year), its cost per unit falls. The reasons are learning by workers, better processes, specialisation, improved product design, and economies of scale. Cost falls by a roughly constant percentage each time cumulative output doubles. The firm with the highest cumulative volume tends to have the lowest cost, and can price low or earn higher margins. This is why firms chase market share early.

The PLC is about demand and the market over time. The experience curve is about cost and the firm's cumulative output. Do not mix them. A firm with a large share early gains cost advantage along the curve, and that advantage matters most in the growth and maturity stages when price competition is high.

Industry evolution is the PLC applied to the whole industry. As an industry moves from emerging to growth, shake-out, maturity and decline, the key success factors, number of competitors, pricing, technology and entry barriers all change. Strategy must be reviewed as the stage changes. Note that the PLC is a guide, not a law: stages differ in length, and not every product follows the same shape.

Key rules to remember

PLC stages: Introduction → Growth → Maturity → Decline; Some texts add a shake-out between growth and maturity for industries. Always name the stage before suggesting strategy.
Experience curve rule: Unit cost falls by a roughly constant % each time cumulative output doubles; A concept rule, not an exact law. Use it to explain cost advantage from cumulative volume.
Illustrative 80% curve: Cost after doubling = 80% × earlier unit cost; The percentage varies by industry. Use it only if the question gives the rate.
Sources of experience effect: Learning + Specialisation + Process improvement + Product redesign + Scale; A list to quote when asked why costs fall.

How to solve Product Life Cycle, Experience Curve and Industry Evolution questions

Use this method for any question on PLC, experience curve or industry evolution, whether theory or case-based.

1Read the question and decide what is asked: stages, experience curve, difference, or strategy for a stage.
2If a case is given, pick out clues: sales growth, profit level, number of competitors, price trends, technology change.
3Name the stage the clues point to, and say why in one line.
4State the key features of that stage: sales, profit, competition, customers, cost.
5Link the strategy: marketing, production, finance and competitive moves that fit that stage.
6If cost or market share is mentioned, bring in the experience curve: cumulative volume lowers unit cost.
7If a rate such as 80% is given, apply it per doubling of cumulative output and show the working.
8Close with a one-line conclusion and, where useful, a limitation: stages vary in length and not all products follow the curve.

Quickest way: Clue, stage, strategy in three lines

When to use it: For MCQs and short case-based written answers when time is tight.

MCQ: match the clue to the stage. Low sales and losses means introduction. Rapid sales rise and new entrants means growth. Slow growth, price wars and shake-out means maturity. Falling sales means decline.
MCQ: if the option talks about cost falling with cumulative output, it is the experience curve. If it talks about sales and profit over time, it is the PLC.
Written: use three parts for each stage: features, strategy, one example. This earns separate marks.
Written: for the difference question, write 4 to 5 points in a two-column style using bullets: basis, PLC, experience curve.
Do not write all four stages in full unless asked. Cover only the stage in the question.

Common mistakes in Product Life Cycle, Experience Curve and Industry Evolution

Treating the product life cycle and the experience curve as the same thing.
Both involve time and both appear in the same chapter.
Fix: Remember: PLC tracks sales and profit across stages. Experience curve tracks unit cost against cumulative output.
Saying unit cost falls with annual output rather than cumulative output.
Students confuse it with ordinary economies of scale.
Fix: Always write 'cumulative volume' or 'accumulated experience' in your answer.
Recommending growth-stage strategy for a mature product.
Students learn a generic strategy list and do not match it to case clues.
Fix: Read the clues first. Slowing sales and price competition mean maturity, so think cost control, differentiation and market segmentation.
Claiming every product passes through all four stages in a fixed pattern.
The model is drawn as a neat curve.
Fix: State that stages vary in length, some products skip stages, and the PLC is a guide, not a rule.
Saying profits are highest in introduction.
Students confuse novelty with profitability.
Fix: Introduction has high costs and low sales, so profits are usually negative or very low. Profits tend to peak in growth or early maturity.
Writing only definitions and no strategy.
Students stop once the stage features are listed.
Fix: Every stage answer needs a strategy link: what the firm should do and why.

Worked examples

Example 1

A firm sells a smart home device. Sales have grown quickly for three years, profits are rising and several rivals have recently entered the market. Identify the stage of the product life cycle and suggest suitable strategies.

Show the solution

Clues: fast sales growth, rising profits, new entrants. These point to the growth stage.
Features: market accepts the product, volumes rise, unit costs fall, competition begins.
Strategy: improve product quality and add features to stay ahead of entrants.
Strategy: widen distribution and enter new segments to capture growing demand.
Strategy: shift advertising from creating awareness to building brand preference.
Strategy: reinvest profits in capacity so supply keeps pace with demand.
Conclusion: the firm should build share now, because market position gained in growth supports cost and price advantage later.

Answer: The product is in the growth stage. The firm should improve quality, widen distribution, build brand preference and expand capacity to secure market share before the market matures.

Example 2

A manufacturer's first 100 units cost ₹800 per unit. The industry follows an 80% experience curve, where unit cost becomes 80% of the earlier cost each time cumulative output doubles. Find the unit cost when cumulative output reaches 400 units, and state what this means for strategy.

Show the solution

Doubling from 100 to 200 units: cost = 80% × ₹800 = ₹640.
Doubling from 200 to 400 units: cost = 80% × ₹640 = ₹512.
Check: 400 is two doublings of 100, so cost = ₹800 × 0.8 × 0.8 = ₹800 × 0.64 = ₹512.
Total fall in unit cost = ₹800 − ₹512 = ₹288, which is 36% of the original cost.
Meaning: a firm that reaches higher cumulative output sooner has lower unit cost than rivals at the same price.
Strategy: this supports aggressive pricing and early market share building, so cost advantage grows with experience.

Answer: Unit cost at 400 cumulative units is ₹512, a fall of ₹288 (36%) from ₹800. The firm should build volume early to gain a cost lead over rivals.

Exam tips

Past questions often ask for stages with features and strategy. Always give both, not just the stage names.
For the difference between PLC and experience curve, use clear bases: focus, measure, time view, and purpose.
In case studies, quote the clue from the passage before naming the stage. This shows reasoning.
If a numeric rate such as 80% is given, show each doubling step. Method earns marks even if the arithmetic slips.
Link industry evolution to changing key success factors: early on it is technology and awareness, later it is cost and efficiency.

Practice questions from Strategic Analysis: External Environment

Product Life Cycle, Experience Curve and Industry Evolution in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Product Life Cycle, Experience Curve and Industry Evolution: frequently asked questions

What are the stages of the product life cycle?

The four stages are introduction, growth, maturity and decline. Sales and profit differ in each stage, so the firm's strategy must change too. Industry versions sometimes add a shake-out stage before maturity.

What is the difference between the product life cycle and the experience curve?

The product life cycle shows how sales and profit change over the life of a product. The experience curve shows how unit cost falls as cumulative output rises. One is about the market, the other is about the firm's cost.

Why does the experience curve matter for strategy?

A firm with more cumulative output tends to have lower unit cost. That gives it room to cut prices or earn higher margins than rivals. So firms often fight for market share early.

What strategies suit the maturity and decline stages?

In maturity, firms focus on cost reduction, differentiation, segmentation and defending share. In decline, firms may harvest by cutting investment, divest, or serve a profitable niche. The choice depends on how fast demand is falling and the firm's strengths.