Use the Complete Toolkit to connect this model to guidance, working formats and a concrete next step.
Every company with more than one product has the same argument at budget time: which product gets the money? The loudest manager usually wins. The BCG Matrix gives the argument a structure by asking two questions about each product: is its market growing, and are you leading it?
What the BCG Matrix is
Bruce Henderson, founder of the Boston Consulting Group, introduced the growth-share matrix around 1970 in an essay called "The Product Portfolio". It places each product or business unit on two axes:
- Market growth rate (vertical): how fast the whole market is growing.
- Relative market share (horizontal): your share divided by the share of your largest competitor. A value above 1 means you lead.
That creates four quadrants:
- Stars: high growth, high share. They earn well but need investment to keep up with the market.
- Cash cows: low growth, high share. They produce more cash than they need.
- Question marks: high growth, low share. They need cash and may never lead.
- Dogs: low growth, low share. They tie up money and attention.
The logic behind it is the experience curve, another BCG idea: the market leader produces more and so gets cheaper faster. That is why share matters so much in the model.
BCG Matrix example: the life of the iPod
2001 to 2003, question mark: a new product in a young, fast-growing market for digital music players.
Mid-2000s, star: the clear market leader in a market that was still growing fast.
Around 2008 onwards, cash cow: still the leader, but the market for stand-alone players stopped growing.
2010s, dog: smartphones absorbed music players and the market shrank. Apple discontinued the last iPod, the iPod touch, in 2022.
The lesson is that positions move. Apple used the iPod's years as a cash cow while it built the iPhone, and did not fight to save a shrinking category. That is the matrix used well: cash from the cow funds the next star.
One-page model visual
The one-page visual
Use this visual as a quick reference. The card in the deck adds the questions and the steps to run the model on your next real question.
How to map your portfolio in 30 minutes with the card
- Minutes 0 to 5: list the units. Products, product lines or business units, whichever level the budget decision is made at.
- Minutes 5 to 15: find two numbers per unit. Market growth for the next two to three years, and your share relative to the biggest competitor. Estimates are fine if you note the source.
- Minutes 15 to 20: plot them. Draw each unit as a circle sized by its revenue.
- Minutes 20 to 27: assign a role. Build, hold, harvest or exit. Which question marks get a real chance, and which get dropped?
- Minutes 27 to 30: check the cash flow. Do the cash cows produce enough to fund the stars and the chosen question marks?
The card front shows the four quadrants and the back has the steps with an example, so a portfolio review can start without a consultant's template.
Common BCG Matrix mistakes
- Using absolute market share. 20% can mean leadership in a fragmented market or a distant second in a concentrated one. Use share relative to the leader.
- Killing every dog. Some dogs support other products, or serve loyal customers profitably. Check before you cut.
- Milking cash cows to death. Underinvest too long and a cow can lose its lead before the next star is ready.
- Drawing the market too broadly or narrowly. Your share depends on how you define the market, so agree on it first.
Once you know which products to build, the Ansoff Matrix helps choose the growth route. Porter's Five Forces adds a view of how attractive each market really is beyond its growth rate.
BCG Matrix FAQ
-
What is relative market share in the BCG Matrix?
Your market share divided by the share of your largest competitor. If you have 30% and the leader has 15%, your relative share is 2. If you have 10% and the leader has 40%, it is 0.25.
-
What growth rate counts as "high"?
There is no fixed number. Many teams use 10% a year, as in the original matrix, or the average growth of the wider economy or industry as the dividing line.
-
Is the BCG Matrix still useful?
Yes, as a first sort. It ignores synergies between products and markets that are hard to measure, so use it to start the budget discussion, not to end it.
Fund the next star
The BCG Matrix card puts the quadrants and the steps on one card, so the next budget meeting can start from a shared map instead of opinions. The Miro board lets you plot products together, and the Google Sheets template calculates relative share and draws the chart from your numbers. The card is part of the MBA Tools deck.
