The amount of variable costs is dependent on the volume that is produced and/or sold. As a result, variable costs fluctuate and are performance related. Variable costs include:
- Material consumption
- Energy costs
- Freight and transport costs
- Costs for temporary workers
- Piecework wages
If the variable costs increase at the same rate as the production or sales volume, they are referred to as proportional variable costs. Should the variable costs increase at a faster rate, then they are referred to as progressive variable costs. They progressively increase, for example, if the maintenance costs for machines sharply increase due to increased production. Variable costs can also be degressive, meaning that they increase less sharply than the turnover. That can be the case, for example, when you receive volume discounts due to larger purchase volumes.
If you divide a product’s total variable costs by the produced or sold item volume, the result is the variable costs per unit. A product’s sale price should at least be as high as the variable costs per unit, otherwise the company cannot stay in the market for long. This is why the variable costs per unit is also called the absolute minimum price.
The sum of the fixed and variable costs is the total cost.