Variability of "Units" of a Service

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• Goods are typically mass-produced, and each unit is identical to the next.
• Services are often custom-produced, and content can vary widely even from the same vendor using "the same" inputs (consider a haircut).
  • Need for quality control.
  • Variability of individual "inputs" (consider: for services a haircut, you often strongly prefer a particular worker in the shop you frequent).

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