Fixed cost
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Fixed costs are un-expired assets or expenses whose total does not change in proportion to the activity of a business, within the relevant time period or scale of production. For example, a retailer must pay rent and utility bills irrespective of sales volumes. Fixed costs include, but are not limited to, overheads (rent, insurance, and such) and can include direct costs such as payroll (particularly salaries). Capital assets will generally be considered part of fixed costs, but treated differently. Unit fixed costs decline with volume, following a rectangular hyperbola as the inverse of the volume of production.
Variable costs by contrast change in relation to the activity of a business such as sales or production volume. In the example of the retailer, variable costs may primarily be composed of inventory (goods purchased for sale), and the cost of goods is therefore almost entirely variable. In manufacturing, direct material costs are an example of a variable cost.
Along with variable costs, fixed costs make up one of the two components of total cost. In the most simple production function, total cost is equal to fixed costs plus variable costs.
In microeconomics and business, the difference between fixed costs and variable costs (and the related terms average cost and marginal cost) is crucial, as each will influence production decisions for profit maximization differently. In the most simple cases, fixed costs do not affect production decisions, because they cannot be changed, and management will choose to produce if sales prices are above the cost of each additional unit (marginal cost).
Fixed costs should not be confused with sunk costs. From a pure economics perspective, fixed costs may not be fixed in the sense of invariate; they may change, but are fixed in relation to the quantity of production for the relevant time period. For example, a company may have unexpected and unpredictable expenses unrelated to production, and these would not be considered part of variable costs.
It is important to understand that fixed costs are "fixed" only within a certain range of activity or over a certain period of time. If enough time passes, all costs become variable. Similarly, not all indirect costs are fixed costs; for example, advertising expenses are indirect costs that are variable over a slightly longer time frame, as they may not be subject to change in the short term, but may be easily adjustable over a longer time frame.
In accounting terminology, fixed costs will broadly include all costs (expenses) which are not included in cost of goods sold, and variable costs are those captured in costs of good sold. The implicit assumption required to make the equivalence between the accounting and economics terminology is that the accounting period is equal to the period in which fixed costs do not vary in relation to production. In practice, this equivalence does not always hold and depending on the period under consideration by management, some overhead expenses (such as sales, general and administrative expenses) can be adjusted by management, and the specific allocation of each expense to each category will be decided under cost accounting.
In business planning and management accounting, usage of the terms fixed costs, variable costs and others will often differ from usage in economics, and may depend on the intended use. For example, costs may be segregated into per unit costs (costs of goods sold), fixed costs per period, and variable costs as a proportion of revenue. Capital expenditures will usually be allocated separately, and depending on the purpose, a portion may be regularly allocated to expenses as depreciation and amortization and seen as a fixed cost per period, or the entire amount may be considered upfront fixed costs.
