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Marginal costing

Section 6 of 11

Decision Making: Special Orders

Scenario: a one-off order at below the normal selling price from a new customer

Decision rule: accept if contribution is positive — fixed costs are already covered by regular sales and are not relevant to this decision

Key conditions to check:

  • Firm must have spare capacity (if at full capacity, opportunity cost must be considered)
  • Accepting must not undercut prices for existing customers

Example (firm at 80% capacity):

  • Normal SP £300; Special order SP £200; VC per unit £180
  • Contribution per unit = £200 − £180 = £20
  • 600 units → total additional contribution = £12,000 → accept

For/Against considerations:

For acceptingAgainst accepting
Positive contribution earnedNo credit history with new customer
Uses otherwise idle spare capacityExisting customers may demand same lower price
Potential for future repeat ordersExchange rate risk if overseas customer
Contribution may be small relative to risk

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