IB Business Management HLTopic 4 — MarketingPaper 1 & 2Core skill~10 min read
Managing a Product Portfolio
Most businesses sell several products at once, and they are never all doing well at the same time. The Boston matrix sorts them into four groups using just two questions: how big is our share, and how fast is the market growing? Then it tells you what to do with each one.
📘 What you need to know
The Boston (BCG) matrix plots each product by relative market share and market growth rate.
Four categories: star, cash cow, question mark (problem child) and dog.
Four strategies: hold stars, harvest cash cows, build question marks, divest dogs.
Cash cows fund the rest of the portfolio — that is the whole point of the tool.
Cash flow differs by quadrant: strongly positive for cash cows, often negative for question marks.
A balanced portfolio has products in every quadrant, not just the profitable ones.
Limitations: only two factors, based on today’s data, ignores how products help each other, and takes time to build.
Why a business needs a portfolio
Relying on one product is dangerous. When it reaches decline, the whole business declines with it. A portfolio spreads the risk: while one product is fading, another is growing, and a third is quietly paying for both.
The problem is deciding where the money goes. Every product manager thinks their product deserves more. The Boston matrix is a way of answering that argument with evidence.
Relative market share means your share compared with the biggest rival, not the raw percentage. A 20% share is high if the leader has 10% and low if the leader has 50%.
Where the money actually flows
This is the part students skip, and it is the heart of the tool. The matrix is not a scoreboard. It is a plan for moving cash from the products that generate it to the products that need it.
A portfolio of nothing but stars sounds wonderful and is actually a cash crisis. Somebody has to be paying the bills while the exciting products grow.
Product type
What it looks like
What to do with it
Star
High share of a fast-growing market. Cash comes in, but plenty goes back out to defend the position
Hold. Keep investing in product development, marketing and new distribution channels. Push into new regions while the market is still growing
Cash cow
High share of a mature market. Steady sales, low investment needed, strong positive cash flow
Harvest. Protect the share through branding and quality, streamline operations to squeeze out costs, and take the cash to fund everything else
Question mark
Low share of a fast-growing market. Cash flow is usually negative because the business is spending to catch up
Build selectively. Research which ones can realistically become stars, back those, and pull funding from the rest
Dog
Low share of a market that is not growing. Little revenue and no obvious future
Divest. Sell it, or plan an orderly exit. Keep it only if it still covers its own costs or supports another product
Before you write “divest the dog”, ask one question: could this product survive as a small niche once the big firms have left? Plenty of “dead” products became profitable again when demand returned and every large competitor had already walked away.
What the matrix cannot tell you
Only two factors. Share and growth ignore competition, technology, costs and what customers actually think.
High share does not guarantee profit. Some industries have huge market leaders on tiny margins.
It looks backwards. It uses today’s data and says nothing about where the market is heading.
It ignores links between products. A dog may exist only to complete a range, or to bring customers in for something else.
It takes work. Getting accurate share and growth data costs time and money, and fast markets need frequent updates.
Worked examples
WORKED EXAMPLE 1
A drinks firm sells four products. Cola: 34% share, market growth 1%. Energy drink: 6% share, market growth 18%. Sparkling water: 29% share, market growth 14%. Diet lemonade: 4% share, market growth 2%. Place each in the Boston matrix. [4 marks]
Step 1: Sort by growth first
High growth: energy drink and sparkling water. Low growth: cola and diet lemonade.
Step 2: Now split each pair by share
Sparkling water has a big share of a growing market. The energy drink does not.
Step 3: Place themSparkling water = star. Energy drink = question mark.Cola = cash cow. Diet lemonade = dog.Star, question mark, cash cow, dogMarks are for the reason, not the label. Quote the share and growth figures for each one.
WORKED EXAMPLE 2
Using the portfolio above, recommend how the firm should use the cash generated by its cola. [6 marks]
Step 1: Say where the cash comes from
Cola is a cash cow: high share, flat market, low investment needed, so it throws off cash.
Step 2: Say where it should go
Into the energy drink, the question mark, to buy share while the market is still growing at 18%.
Step 3: Note the risk and the alternative
Question marks often fail. Some cash should also defend the sparkling water star from rivals.
Fund the energy drink, but hold back enough to defend the starBest final line: if research shows the energy drink cannot reach a leading share, cut it and spend the money on the star instead.
💡 Exam tip
Draw the matrix if you are asked to apply it. Label both axes with high and low at the correct ends.
Share goes high on the left. Putting it the other way round loses marks and confuses your own answer.
Justify every placement with the actual share and growth figures from the case.
Talk about cash flow, not just profit. That is what the tool is really about.
Comment on whether the portfolio is balanced. Too many question marks is a warning sign.
For evaluation, name at least one limitation and explain why it matters for this particular business.
⚠ Common mix-up
Market growth is not the product’s own sales growth. It is the whole market’s rate.
Question marks are not dogs. Both have low share, but a question mark is in a growing market and has a future.
Cash cows are not failures. Low growth just means the market is mature.
Stars are not the most profitable. They eat cash defending their position.
The Boston matrix is not the product life cycle. One is about a portfolio, the other about one product over time.
Divesting is not automatic. Check whether the dog still covers its costs first.
Up next: Branding and Brand Value — why the same product sells for twice as much with a different name on it.
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