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Acronym for fear, uncertainty and doubt. It is a marketing term that is often used to cast a shadow over a competitor's product when your own is unable to compete. FUD is a technique used by larger companies who have a large market share. The FUD acronym was first freely defined by Gene Amdahl after he left IBM to found his own company, Amdahl Corp, with this statement: "FUD is the fear, uncertainty, and doubt that IBM sales people instill in the minds of potential customers who might be considering Amdahl products."

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