IB Business Management SLTopic 4 — The Seven PsPaper 1 & 2Core skill~10 min read
Managing a Product Portfolio
Most firms sell more than one thing, and the products are never all doing well at once. The Boston Matrix is a simple way of sorting them into four boxes so a business can decide where to put its money — and, just as importantly, where to stop putting it.
📚 What you need to know
The Boston Consulting Group (BCG) matrix analyses a firm’s product portfolio and helps it make decisions about each product.
Products are classified on two things only: relative market share and market growth rate.
The four categories are star, question mark (problem child), cash cow and dog.
Each category has a typical cash flow and a typical strategy: hold, build, harvest or divest.
Cash cows usually fund question marks and stars.
Limitations: it is simplistic, backward-looking, ignores links between products, and takes time to compile.
The four boxes
Read the matrix like a map. Across the top is relative market share — how big the product is compared with rivals. Up the side is market growth rate — how fast the whole market is expanding. Where a product lands tells you what it is doing to the firm’s cash.
Watch the top axis. High share is on the left in the standard matrix, so plotting a product on the wrong side is an easy way to lose marks.
Product type
What it is
Cash flow and implications
Cash cow
High market share in a mature market that is no longer growing
Generates strong positive cash flow but has little growth potential. The firm invests as little as possible and uses the cash to fund other products. Marketing focuses on holding share and profitability
Question mark
Low market share in a fast-growing market. Could become a star with investment
Usually negative cash flow, because the firm has to spend to build share. If the investment does not produce growth, the product may be discontinued. Marketing focuses on raising share and recognition
Star
High market share in a fast-growing market
Generates significant cash but also absorbs a lot of it, because the position must be defended. Marketing focuses on brand building and increasing share while growth lasts
Dog
Low market share in a market with little or no growth
Generates little revenue and has no growth potential. Firms often divest to concentrate on more profitable lines, and marketing spend is minimal or zero
The four strategies
Each box has a matching strategy. Learn these four words — they are the quickest way to show you know the model rather than just the labels.
Strategy
Applies to
What the firm does
Hold
Stars
Keep investing in product development, marketing and innovation to defend a strong position, and push into new geographical markets while growth lasts
Build
Question marks
Research which ones have real potential, invest selectively in those, and withdraw resources from the rest. The aim is to convert them into stars
Harvest
Cash cows
Protect existing share through branding and loyalty, streamline operations to cut costs, and pull the cash out to fund other products
Divest
Dogs
Sell off the product or business unit, or plan an orderly exit if it has no future prospects. Keep it only while it still generates some cash
Why cash cows matter so much
The four boxes are not independent. A firm’s cash cows pay for everything else, and that circulation is the real point of the model.
This is why “balanced portfolio” is the phrase examiners want. A healthy firm needs products in more than one box at the same time.
Before you recommend divesting a dog, ask whether the low-growth market could become a profitable niche. When big manufacturers abandoned record players decades ago, smaller specialists stayed in, and the later revival in vinyl turned some of those dogs into cash cows.
Limitations of the matrix
Limitation
Why it matters
Simplistic
It uses only growth and share, ignoring competition, technology and customer preferences. High share does not always mean high profit — some large firms in very competitive industries hold big shares on tiny margins
No focus on the future
It is built on current data and says nothing about emerging trends, which limits its use for long-term planning
Ignores links between products
Products are treated as standalone, so it misses cases where a dog is kept because it brings customers to a star, or because they share a production line
Time consuming
Accurate data on market growth and share takes time and expertise to gather, and fast-moving markets mean it needs updating often
WORKED EXAMPLE
A drinks firm sells three products. Bottled water: 31% share, market growing 1% a year. Energy drink: 4% share, market growing 14% a year. Diet cola: 3% share, market shrinking 2% a year. Place each in the matrix and recommend a strategy. [6 marks]
Step 1: place each productBottled water — high share, low growth, so a cash cow. Energy drink — low share, high growth, so a question mark. Diet cola — low share, negative growth, so a dog.Step 2: match the strategiesHarvest the water, build the energy drink, divest the cola.Step 3: connect themUse the water’s cash to build the energy drinkThe water needs little investment and throws off cash. The energy drink sits in the only growing market the firm has, so it is the one product with a realistic route to becoming a star.Step 4: judge itBuilding share at 4% in a fast-growing market will be expensive and may fail, and the firm would then have spent its cash-cow profits for nothing. It should also check whether the cola shares bottling lines with the water before divesting.
💡 Exam tip
Draw the matrix if the question asks you to apply it, with both axes and all four headings labelled accurately. That is the knowledge mark.
Explain why you placed each product where you did, referring to its share and its market’s growth rate. That is the application mark.
Look for the clues in the stimulus — phrases like “the market has stopped expanding” or “sales are rising across the industry” are the growth rate in disguise.
Use the four strategy words — hold, build, harvest, divest.
Question the model at the end. Saying it ignores links between products or is based on past data is a ready-made evaluation point.
⚠️ Common mix-up
Putting high market share on the right. In the standard matrix it goes on the left.
Confusing market growth with sales growth. The axis is about the whole market, not the firm’s own sales.
Assuming stars are the most profitable. Stars swallow cash defending their position; cash cows are usually the profit engine.
Automatically divesting every dog. Dogs can be worth keeping for a niche, or because they support other products.
Treating the BCG matrix as a decision rather than a starting point for one. It is a snapshot, not an instruction.
Mixing it up with the product life cycle. The PLC tracks one product over time; the BCG matrix compares several products at one moment.
Up next: Branding and Brand Value — how a name on a package becomes something a firm can charge extra for and even put on its balance sheet.
Want this explained one-to-one?
Book a free session with an experienced IB Business Management tutor and get your trickiest topics made simple.
