Average Fixed Cost

What is Average Fixed Cost?

In economics and business accounting, the Average Fixed Cost (AFC) represents the fixed expenses of production per unit of output. Unlike variable costs, fixed costs do not change with the volume of goods or services produced. Examples of fixed costs include rent, salaries of administrative personnel, insurance premiums, and equipment depreciation.

As production increases, the total fixed cost is spread over a larger number of units. Consequently, the Average Fixed Cost decreases. This mathematical relationship is a key driver of economies of scale, where higher output volumes lead to lower per-unit costs.

The Average Fixed Cost Formula

The calculation for Average Fixed Cost is straightforward. It is calculated by dividing the Total Fixed Cost (TFC) by the Quantity of Output (Q) produced:

\[ \text{Average Fixed Cost (AFC)} = \frac{\text{Total Fixed Cost (TFC)}}{\text{Quantity of Output (Q)}} \]

Alternatively, if you know the Average Total Cost (ATC) and the Average Variable Cost (AVC), you can find the AFC using:

\[ \text{AFC} = \text{ATC} - \text{AVC} \]

Example Calculations

Example 1 (Simple Mode): Suppose a bakery has monthly fixed costs (rent, insurance, salaries) totaling $3,000. If they bake 1,500 loaves of bread in a month:

• Total Fixed Cost (TFC) = $3,000
• Quantity (Q) = 1,500
• $\text{AFC} = \frac{\$3,000}{1,500} = \$2.00$ per loaf.

Example 2 (Inverse Scaling): If the same bakery increases production to 3,000 loaves:

• Total Fixed Cost (TFC) = $3,000
• Quantity (Q) = 3,000
• $\text{AFC} = \frac{\$3,000}{3,000} = \$1.00$ per loaf.

This demonstrates how doubling production cuts the per-unit fixed cost in half.