The monthly cost of supervising a production line is £8,000 for up to 10,000 units. If output exceeds 10,000 units, a second supervisor is needed and the cost rises to £16,000 for up to 20,000 units. How is this cost described?

Answer and explanation

Correct answer: C. A stepped fixed cost

  1. Step 1: Within each band the cost is constant, so it is fixed in the short run.
  2. Step 2: It then jumps at a threshold, which is the definition of a stepped fixed cost.
Answer
A stepped fixed cost.
Why not the others: A semi-variable cost: A semi-variable cost has a fixed element plus a variable element that changes with every unit, which is not the pattern here. A variable cost: A variable cost changes in direct proportion to each unit, and this cost is constant within each band. A direct material cost: Supervision is a labour-related indirect cost and is not material.

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