Your most unhappy customers are your greatest source of learning.

Analyse

The exact phrase “Your most unhappy customers are your greatest source of learning.” appears on page 69 of Business @ the Speed of Thought, published in 1999. The quote is consistently cited in reputable quote databases referencing that page. No credible source attributes the wording to anyone else in that context.

Achtergrond

Bill Gates’ book discusses how information technology can improve business decision‑making, and he emphasizes learning from dissatisfied customers as a way to drive improvement. The quote has been widely circulated and attributed to Gates, often appearing in business literature and motivational compilations.

Samenvatting verdict

Bill Gates indeed wrote that line in his 1999 book Business @ the Speed of Thought.

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