# BCG Growth-Share Matrix The BCG growth-share matrix sorts business units by market growth and relative market share into stars, cash cows, question marks, and dogs, to decide where cash should go. **The question.** Which of our businesses generate cash, which consume it, and which of the cash users are worth funding? Also known as: Also called the Boston Box, the Boston matrix, or the product portfolio matrix. Henderson's 1970 essay calls dogs pets. Question marks are also called problem children or wildcats. ## When to use it - A diversified group lets each unit keep and reinvest its own cash, and the board wants a basis for moving money between units. - Every division head is asking for growth capital, and the requests add up to more than the cash the group generates. - A portfolio review needs a first sort of units before detailed work, and share and growth data already exist. - Units compete in markets where scale and accumulated volume really do drive unit cost, so share is a fair stand-in for cost position. ## When to avoid it - Share does not drive cost or margin, as in many services, software, and niche businesses where the share leader is not the most profitable firm. The horizontal axis then measures the wrong thing. - Market boundaries are contested. Relative share swings with the boundary you draw, and the review turns into an argument about definitions. - The units share customers, plants, or technology. The matrix treats each unit as standalone, and selling a dog can take volume or overhead absorption away from a cow. - Share and growth are poor proxies for position and attractiveness. The GE-McKinsey matrix scores several factors on each axis. ## Overview The growth-share matrix places each business unit by the growth rate of its market and its share relative to the largest rival, then gives each of the four cells a role in the group's cash flow. Leaders in slow markets fund the few challengers in fast markets that can still become leaders, and weak units in slow markets are fixed, harvested, or sold. The decision it supports is where a diversified group's spare cash should go. The logic depends on the experience curve: the share leader is assumed to have the lowest costs, so share stands in for profitability. Where that link is weak, the labels mislead. Check each unit's actual profit and cash flow before acting on its cell, and check what the other units depend on before selling a dog. ## The four cells ### Stars High relative share in a fast-growing market. Stars usually report profits but may not fund their own growth, because holding share in a growing market takes capacity and working capital. If a star keeps its lead as growth slows, it becomes a cash cow. The posture is to reinvest enough to hold or gain share. ### Cash cows High relative share in a slow-growing market. Cows generate more cash than they need to hold their position, and Henderson argued that the surplus should go elsewhere rather than back into the cow. The posture is to hold share at the lowest investment that keeps the lead, and to send the rest to selected question marks or to shareholders. ### Question marks Low relative share in a fast-growing market. They need more cash than they produce, and a question mark that only holds its share becomes a dog when growth slows. The posture is a choice. Fund the few that can reach leadership heavily enough to get there, and exit the rest early. ### Dogs Low relative share in a slow-growing market. Henderson called them pets and treated them as evidence of a failure to lead or to exit. In practice many dogs earn a profit, hold a defensible niche, or carry sales for other units. The posture is to harvest, to narrow the unit to a segment it can lead, or to sell, after checking what else depends on it. ## What it is not - A profitability ranking. Cells come from share and growth, and a dog can earn more than a star. Check each unit's profit and cash flow before acting on its label. - A rule that a healthy portfolio has units in all four cells. A group made up mostly of cash cows is not broken. Henderson's balance was about matching the cash a portfolio throws off to the cash it can usefully invest. - A measure of market attractiveness. Growth is one feature of a market. A fast-growing market with thin margins and powerful buyers can still be a poor place to invest. ## The steps 1. **Define each unit's market.** Write down the product and geographic boundary of each unit's served market before any data is collected. Share depends on the boundary, so set definitions centrally and apply them the same way to every unit. 2. **Measure relative share.** Divide the unit's share by the share of its largest rival. For the leader, that is the second-largest firm, so the leader scores above 1.0. Use industry data and customer interviews, not the unit head's estimate, and plot on a log scale with the dividing line at 1.0. 3. **Measure market growth.** Use forecast real growth of the served market over the planning period, not last year's figure. Set the dividing line for this portfolio and write down why. Textbooks often use 10 percent, which puts nearly every mature industrial market in the bottom half. 4. **Plot with cash and profit beside each unit.** Size each bubble by revenue and write each unit's cash flow after investment next to it. A cow that consumes cash or a dog that throws it off is where the discussion should go. 5. **Assign cash roles and check dependencies.** Give each unit a role, such as reinvest, hold, harvest, or exit, and an amount of capital. Before any exit, list shared customers, plants, and overheads, and estimate what the remaining units lose. 6. **Replot every planning cycle.** Markets slow and leaders change. Track how each unit moved since the last plot, and treat a star sliding toward question mark as a warning. ## In practice Seven division heads at a specialty chemicals group came to the capital review with requests worth about twice the group's free cash flow. The consultant asked each division for a served-market definition, then plotted them. Industrial adhesives led its market at 1.8 times the share of the next rival, in a market growing about 2 percent a year, so it was the cash cow. Battery-pack coatings held 0.3 times the leader's share in a market growing about 18 percent, a question mark. Two other units in water treatment and printing resins were question marks too. A sealants unit, at 0.4 relative share in a flat market, was a dog. The adhesives head expected his request to be cut, and it was, to maintenance capital plus a cost program, but not to zero, because a rival was adding capacity. Battery coatings got most of the freed cash, tied to a share target over three years. The resins unit was closed and water treatment kept on a small budget until a pending contract was decided. Sealants stayed. Most of its volume went out on the same orders as adhesives, and selling it would have handed those customers a reason to try a rival. ## What you leave with - A written market definition for each unit, with the share and growth figures behind its placement. - A bubble chart of the portfolio with revenue and cash flow after investment for each unit. - A cash role and capital amount for each unit, showing how much moves from cows to selected question marks. - A short list of question marks to fund, each with the share target that would justify the money, and a list to exit. - The dependencies between units that have to be resolved before any sale or closure. ## Failure points ### Markets drawn to suit the unit Unit heads narrow their market until they lead it, and every unit turns into a star or a cow. Without central definitions set before the data comes in, the chart reflects negotiating skill. ### Starving the cow The cow is cut to near-zero investment, a rival adds capacity or cuts price, and the share that made the cow lucrative erodes. The cash the plan counted on falls short just as the question marks need it. ### Funding every question mark a little Cash is spread across all the question marks to avoid choosing. None of them reaches leadership before growth slows, and the group ends up with several new dogs. Henderson's logic calls for funding a few fully. ### Selling a dog the others depend on The dog is sold on its own numbers, and the group then loses shared volume, plant absorption, or bundled customers. Group margin falls after a sale that looked accretive on paper. ### Share treated as the cause of profit In markets where experience effects are weak, units buy share with price cuts and never get the cost advantage the matrix assumes. BCG's own 2014 review reported that relative share had become a weaker predictor of performance. The failures above are usually [Framing](https://usefulconsultingframeworks.com/your-edge/#framing): the wrong problem was chosen before this framework was applied. ## Origin Bruce Henderson, the founder of the Boston Consulting Group, set out the logic in "The Product Portfolio," a short Perspectives essay published in 1970. The sketch of the grid itself is reported to have come from BCG consultant Alan Zakon and colleagues. Henderson's argument rests on four rules about cash: margins follow market share, which the experience curve explains; growth needs cash to finance added assets; share has to be earned or bought; and no market grows forever, so the payoff from growth comes when growth slows. He called the low-share, low-growth units pets. Dog is the later and more common name. The horizontal axis is relative market share, the unit's share divided by that of its largest competitor, usually drawn on a log scale. In 2014 BCG's own Strategy Institute revisited the matrix and reported that companies were moving between quadrants faster than before and that relative share had become a weaker predictor of performance. It argued for using the matrix more often and with more experiments in the question-mark cell. When you present it, credit BCG and Henderson. ## Further reading - [The Product Portfolio](https://www.bcg.com/publications/1970/strategy-the-product-portfolio). Bruce Henderson, BCG Perspectives, 1970. The original essay, short and free on BCG's site. Read it for the four cash rules, which the cell names tend to hide. It uses pets for dogs. - [BCG Classics Revisited: The Growth Share Matrix](https://www.bcg.com/publications/2014/growth-share-matrix-bcg-classics-revisited). Martin Reeves, Sandy Moose, and Thijs Venema, BCG, 2014. BCG's own review of the matrix, with data on faster movement between quadrants and a weaker link between share and performance. Free. ## Related frameworks - [GE-McKinsey Nine-Box Matrix](https://usefulconsultingframeworks.com/frameworks/ge-mckinsey-matrix/): Replaces the single measure on each axis with weighted scores on a three-by-three grid. Pick it when share and growth are poor stand-ins for competitive position and industry attractiveness. - [Product Life Cycle](https://usefulconsultingframeworks.com/frameworks/product-life-cycle/): Explains why market growth slows and stars drift into cows. Use it to judge where each unit's market is heading on the growth axis. - [Ansoff Matrix](https://usefulconsultingframeworks.com/frameworks/ansoff-matrix/): Lays out growth routes for a single business. Pick it when the question is where one unit should grow, not how to split cash across units. Last updated October 20, 2026.