What is Average Cost?
Average cost is the total production cost divided by the number of units produced. It reveals the cost per unit—critical for pricing, profitability analysis, and competitive strategy.
Average cost (AC) is total cost divided by total units: AC = TC ÷ Q. For example, if 100 units cost £1000 to produce, the average cost per unit is £10.
Step-by-step worked examples
A bakery's total monthly cost is £3000, producing 300 loaves. What is the average cost per loaf?
Total cost = £3000 Total units = 300 loaves AC = £3000 ÷ 300 = £10 per loaf
A factory produces 1000 units annually at a total cost of £25,000. Calculate average cost.
Total cost = £25,000 Total units = 1000 AC = £25,000 ÷ 1000 = £25 per unit
A startup incurs £50,000 in fixed costs plus £5 per unit. At 2000 units, what is AC?
Total cost = £50,000 + (£5 × 2000) = £50,000 + £10,000 = £60,000 AC = £60,000 ÷ 2000 = £30 per unit
Flashcards
Quick quiz
Q1.Total cost is £5000 for 200 units. What is average cost?
Q2.AC typically falls at first because…
Q3.A firm has £10,000 in fixed costs and £2 variable cost per unit. At 2000 units, what is AC?
Q4.What does a U-shaped AC curve tell us?
The full card deck, worked steps and AI-tutor support for “What is Average Cost?” are in Notek — study by hand before your exam.
Common mistakes
Confusing AC with total cost. — Correct: AC is per unit; TC is the sum of all costs.
AC always falls with more production. — Correct: AC falls initially (economies) but eventually rises (diseconomies).
Fixed costs don't affect AC. — Correct: Fixed costs strongly affect AC, especially at low volumes.
AC and MC are always equal. — Correct: AC and MC are equal only at the point where AC is lowest.
FAQ
What is average cost?
Total production cost divided by the number of units produced: AC = TC ÷ Q.
How do you calculate average cost?
Add up all production costs (fixed + variable), then divide by the number of units made.
Why does average cost fall with scale?
Fixed costs (factories, machines) are divided by a larger number of units, lowering the per-unit cost.
When does the AC curve start to rise?
When variable costs (labour, materials) increase faster than the benefit from spreading fixed costs.