What is Marginal Cost?
Marginal cost is the incremental cost of producing one additional unit of output. It equals the change in total cost divided by the change in quantity produced. In the short run, marginal cost typically includes only variable costs because fixed costs do not change with output. Marginal cost analysis underpins pricing, capacity, and order-acceptance decisions.
How It Works
- Marginal Cost = Change in Total Cost / Change in Quantity.
- In the short run, MC = additional variable cost per extra unit.
- Compare MC to marginal revenue: produce while MR > MC.
- Profit is maximized where MR = MC.
- Special orders should be accepted when price > marginal cost (assuming spare capacity).
Saudi Context
Saudi manufacturers and contractors evaluate special orders, bulk discounts, and export pricing through marginal cost lenses. The Saudi petrochemical sector (SABIC and others) operates with very high fixed costs and relatively low marginal costs, making capacity utilization a critical profit lever in cyclical commodity markets.
Example
A bakery’s total cost to produce 1,000 loaves is SAR 4,000. To produce 1,001 loaves, total cost rises to SAR 4,002. Marginal cost of the 1,001st loaf = SAR 2. If a customer offers SAR 5 per loaf for an extra 100 loaves and capacity is available, the bakery should accept (price > MC).