Definition
The BCG Matrix classifies business units/products by market growth rate (proxy for opportunity) and relative market share (proxy for competitive strength) into Stars, Cash Cows, Question Marks, Dogs to guide investment and harvesting.

Introduction
In multi-business firms, capital is scarce. A simple, comparable lens helps decide where to invest, maintain, or divest. BCG’s 2×2 remains a powerful first cut—when combined with deeper economics.

Explanation

Axes:

Y: High/Low market growth → future potential, cash needs.

X: High/Low relative share → current advantage, cash generation.

Quadrants:

Stars (High growth, High share): invest to defend leadership → future cows.

Cash Cows (Low growth, High share): harvest for cash; fund the portfolio.

Question Marks (High growth, Low share): selective bets or exit; can become Stars or burn cash.

Dogs (Low growth, Low share): divest/harvest unless strategic spillovers exist.

Moves: resource reallocation, pricing stance, capability building, exit options.

Limits: ignores profitability variance, synergies, barriers, and disruption dynamics—use with complementary tools.

Key Takeaways

Use BCG to prioritize capital quickly; validate with unit economics.

Stars consume cash today to become tomorrow’s cows.

Question Marks need a clear path or an exit.

Real-World Case
A diversified consumer firm treated its leading detergent brand as Cash Cow (funding) while investing in a fast-growing eco-home category Question Mark to achieve Star status within three years via targeted M&A and D2C.