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A product portfolio can be analysed using the Boston Matrix.

Star products have a high market share in a fast growing market.

Cash cows have a high market share in a slow growing market.

Question marks or Problem children products have a low market share in fast growing markets.

Dogs are products with a low market share in slow growing markets.

Firms with just a few items in their product portfolio – or who have all their products at the same stage in the product life cycle – are in the dangerous position of having all their eggs in one basket. Such firms may prioritise broadening their product range.