What Is the Boston Matrix? Four Categories Explained
Learn how the Boston Matrix classifies products as stars, question marks, cash cows or dogs using market growth and relative market share in A Level Business.
The Boston Matrix is a tool businesses use to review their product portfolio: the range of products they sell. It places each product in one of four categories using market growth and relative market share. Market growth describes how quickly the overall market is expanding; relative market share compares a product’s sales with those of its largest competitor.
| Category | Market growth | Relative market share | What it means |
|---|---|---|---|
| Star | High | High | A leading product in a growing market. It may need continued investment to maintain its position. |
| Question mark | High | Low | A product in a growing market that has not yet gained a strong position. The business must decide whether to invest in it. |
| Cash cow | Low | High | An established, strong-selling product in a slower-growing market. It may generate cash that can support other products. |
| Dog | Low | Low | A product with a weak position in a slower-growing market. The business may consider changing, retaining or withdrawing it. |
For example, imagine a business selling an established drink that leads a slow-growing market. It would be a cash cow. If the business launches a new drink in a fast-growing market but competitors still outsell it, that product would be a question mark.
The matrix helps managers consider where to invest and how to balance products at different stages. It does not make the decision for them: a question mark may never become a star, and a dog might still be worth keeping if it serves loyal customers.
Exam mistake: Do not confuse a product’s own sales growth with market growth. The matrix asks whether the whole market is growing, as well as how the product compares with its largest competitor.
