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2. Marginal/Variable Cost
The additional cost of producing and selling one more unit.
Here:
₹8 + ₹6 + ₹1.50 + ₹1 = ₹16
This is the key figure for the special order.
3. Opportunity Cost
When capacity is insufficient, accepting one order means sacrificing another opportunity.
In part (c), the company sacrifices 3,000 home-market units.
Lost contribution:
3,000 × (₹25 − ₹16) = ₹27,000
That is the opportunity cost.
Final Exam-Style Conclusion
(i) The foreign order of 5,000 units at ₹18 should be accepted, because the firm has 5,000
units of idle capacity and the order gives an additional contribution of ₹10,000.
(ii)(a) If the customer is a domestic customer, the order should generally be rejected if it
adversely affects the existing home-market selling price of ₹25, because it may cause a
reduction in normal-market contribution.
(ii)(b) At ₹15 per unit, the order should be rejected, because the variable cost itself is ₹16
per unit, resulting in a loss of ₹1 per unit.
(ii)(c) The order of 8,000 units at ₹22 should be accepted. Since only 5,000 units of capacity
are idle, 3,000 home-market units must be sacrificed. The foreign order provides ₹48,000
contribution, while the lost home-market contribution is ₹27,000. Thus, there is a net
additional contribution/profit of ₹21,000.
Golden Rule:
Spare capacity → compare special-order price with variable cost.
No spare capacity → also consider opportunity cost.