hair care product
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- Shampoo is produced for people with oily hair, dry hair, and (even) normal hair; for particular pH balances; for "environmentally aware" customers; for those who want conditioner added; and so on.
- B. Joseph Pine (1993). Mass Customization: The New Frontier in Business Competition. Harvard Business Press. p. 38. ISBN 978-0-87584-372-8.