Cost

Comparing private, external, and social costs

When a transaction takes place, it typically involves both private costs and external costs.

Private costs are the costs that the buyer of a good or service pays the seller. This can also be described as the costs internal to the firm's production function.

External costs (also called externalities), in contrast, are the costs that people other than the buyer are forced to pay as a result of the transaction. The bearers of such costs can be either particular individuals or society at large. Note that external costs are often both non-monetary and problematic to quantify for comparison with monetary values. They include things like pollution, things that society will likely have to pay for in some way or at some time in the future, even so that are not included in transaction prices.

Social costs are the sum of private costs and external costs.

For example, the manufacturing cost of a car (i.e., the costs of buying inputs, land tax rates for the car plant, overhead costs of running the plant and labor costs) reflects the private cost for the manufacturer (in some ways, normal profit can also be seen as a cost of production; see, e.g., Ison and Wall, 2007, p. 181). The polluted waters or polluted air also created as part of the process of producing the car is an external cost borne by those who are affected by the pollution or who value unpolluted air or water. Because the manufacturer does not pay for this external cost (the cost of emitting undesirable waste into the commons), and does not include this cost in the price of the car (a Kaldor–Hicks compensation), they are said to be external to the market pricing mechanism. The air pollution from driving the car is also an externality produced by the car user in the process of using his good. The driver does not compensate for the environmental damage caused by using the car.

Cost estimation

When developing a business plan for a new or existing company, product or project, planners typically make cost estimates in order to assess whether revenues/benefits will cover costs (see cost–benefit analysis). Costs are often underestimated, resulting in cost overruns during execution.

Cost-plus pricing is where the price equals cost plus a percentage of overhead or profit margin. In business economics, the profitability of a trade or sales prospect relies on the ability of an enterprise to sustain market prices that cover all costs and leave a surplus for owner interest, as expressed by:

${\displaystyle \text{Profit = Revenues – Costs}.}$

Manufacturing costs vs. non-manufacturing costs

Manufacturing costs are those costs that are directly involved in manufacturing of products. Examples of manufacturing costs include raw materials costs and charges related to workers. Manufacturing cost is divided into three broad categories:

1. Direct materials cost
2. Direct labor cost
3. Manufacturing overhead cost

Non-manufacturing costs are those costs that are not directly incurred in manufacturing a product. Examples of such costs are salary of sales personnel and advertising expenses. Generally, non-manufacturing costs are further classified into two categories:

1. Selling and distribution costs
2. Administrative costs

Other costs

A defensive cost is an environmental expenditure to eliminate or prevent environmental damage. Defensive costs form part of the genuine progress indicator (GPI) calculations.

Labour costs would include travel time, holiday pay, training costs, working clothes, social insurance, taxes on employment &c.

Path cost is a term in networking to define the worthiness of a path, see Routing.

Non-monetary costs can be related to intrinsic motivation.