Short-run cost refers to the costs incurred by a firm when at least one factor of production, such as capital or land, remains fixed while others, like labor or raw materials, can be varied. In the short run, costs are categorized into fixed costs (unchanging with output levels, e.g., rent) and variable costs (changing with output, e.g., materials). The total cost is the sum of fixed and variable costs. Short-run cost analysis helps firms determine optimal production levels by evaluating how costs behave with output changes. It is essential for understanding efficiency, pricing strategies, and short-term decision-making.
Cost concepts that are taken into consideration in the Short run:
1. Fixed Costs (FC)
These costs remain constant regardless of the level of output. Examples include rent, salaries of permanent staff, and depreciation of machinery. Fixed costs do not change with production variations in the short run.
2. Variable Costs (VC)
These costs vary directly with the level of output. Examples include costs of raw materials, wages for temporary workers, and energy usage. Variable costs increase as production rises and decrease when production falls.
3. Total Cost (TC)
The total cost is the sum of fixed and variable costs at a given output level.
Formula: TC = FC + VC
4. Average Fixed Cost (AFC)
The fixed cost per unit of output. As output increases, AFC decreases, leading to a “spreading effect.”
Formula: AFC = FC / Q
where Q is the quantity produced.
5. Average Variable Cost (AVC)
The variable cost per unit of output. It typically decreases initially due to increasing returns and then rises as diminishing returns set in.
Formula: AVC = VC / Q
6. Average Total Cost (ATC)
The total cost per unit of output, combining both fixed and variable components.
Formula: ATC = TC / Q or ATC = AFC + AVC
7. Marginal Cost (MC)
The additional cost incurred to produce one more unit of output. MC plays a critical role in determining optimal production levels.
Formula: MC = ΔTC / ΔQ