[Commerce Class Notes] on Theory of Cost Pdf for Exam

The determination of the price for a product or service is not easy. Several other factors govern it. The theory of cost definition states that the costs of a business highly determine its supply and spendings. The modern theory of cost in Economics looks into the concepts of cost, short-run total and average cost, long-run cost along with economy scales. 

 

The cost function varies concerning factors such as operation scale, output size, price of production, and more. The theory of cost production needs to be understood in detail by economists to run their company and increase its profit and productivity. This article covers all you need to know about cost concepts.

 

Types of Costs

• Accounting Costs / Explicit Costs: The cost of production including employee salaries, raw material cost, fuel costs, rent expenses and all the payments made to the suppliers from the accounting costs.

• Economic Costs / Implicit Costs: According to the modern theory of cost in economics, the investment return amount of a businessman, the amount that could have been earned but not paid to an entrepreneur and monetary rewards for all estates owned by the businessman form the economic costs. These costs include accounting costs and the money also returned which the owner could have earned from elsewhere apart from the business.

• Outlay Costs: These are the recorded account costs or actual expenditure spent on wages, rent, raw materials and more.

• Opportunity Costs: These are the missed opportunity costs. They are not recorded in the account books but show the cost of sacrificed or rejected policies.

• Direct / Traceable Costs: These costs are easily pointed out or identified expenditures such as manufacturing costs. Such costs cater to specific operations or goods.

• Indirect / Non-Traceable Costs: These costs are not related directly or identifiable to any operation or service. Costs such as electric power or water supply are some examples because these expenses vary with output. They generally have a functional relationship with production.

• Fixed Costs: Such costs do not vary with output and are fixed expenditure of the company. For example, taxes, rent, interests are all fixed costs as they do not vary within a constant capacity. Any company cannot avoid these costs.

• Variable Costs: These costs vary with output and are known as a variable cost. For example, salaries of the employee, raw material costs all fall under variable costs. These directly depend on the fixed amount of resources.

 

Theory of Cost in Economics

The modern theory of cost in Economics also specifies economies of scale where an increased production decreases the cost per unit of production. The returns to scale first increase, then stabilize for some time and then decrease. Let’s take a look at the different types of economies—

• Technical: Technical economies include investment in machinery and more efficient capital equipment to increase production efficiency.

• Effective Management: When an organization increases operation, they need a better division of labor into various sub-departments for efficient management.

• Commercial: A large amount of components and raw materials is needed with increased production. Hence raw material costs decrease. The advertisement cost for a unit of production also falls, which increases.

• Finance: With a raised Finance, any company becomes popular. Their banking securities increase and Finance is raised at a much lower cost.

• Risk Management: As the firm becomes more diverse, risk-taking factors also increase.

 

Comparing Short Run and Long Run Costs

As per the theory of cost analysis, during the short run period, a company tries to increase its output by changing only the variable factors such as raw materials or labor. The fixed variables remain untouched. The long-run period is where the company can change any factor to obtain desirable outputs as per their interests. Ultimately all these factors result in cost.

 

Solved Examples

1. Draw a relationship between Total Cost, Total Fixed Cost and Total Variable Cost of a Business.

For any business, 

 

Total Costs (TC) = Total Fixed Cost (TFC) + Total Variable Cost (TVC).

 

2. What is the average fixed cost?

Average fixed cost is defined as the total fixed cost per unit of production. The total fixed cost divided by the number of units gives the average fixed cost.

 

Fun Facts

• The average total cost is the sum of the average variable cost and average fixed cost.

• Marginal cost can be calculated as the total change in cost upon a total change in output.

• Electricity charges are neither fixed nor variable costs. Instead, they are semi-variable costs.

• Stair Step variable cost remains constant for a fixed output. But when the output suddenly exceeds its limit, the cost immediately jumps to a new higher level. The graph of total variable cost v/s output looks exactly like a staircase for such cases.

• According to the modern theory of cost in Economics, the positive slope in the long-run total cost average curve is due to diseconomies of scale.