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The breakeven production quantity is the number of aircraft at which

  • A.The learning curve reaches unity
  • B.Operating cost equals purchase price
  • C.Cumulative revenue equals cumulative cost
  • D.The unit production cost stops falling

Answer: C

Correct answer: Cumulative revenue equals cumulative cost

The breakeven quantity is the number of aircraft at which cumulative revenue finally covers cumulative cost, including the development spend incurred before the first delivery.

\[ N_{BE} = \frac{\text{fixed cost}}{\text{margin per aircraft}} \]

It is the central figure in a programme's business case, because until it is passed the programme has consumed cash without returning it. For a large transport it commonly runs to several hundred aircraft, which is why so few programmes are launched and why launch orders matter so much.

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