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Writer's pictureAn Minh Nguyen

Costs, Scale of production and Break-even analysis

The basics

  • Businesses must make a profit to survive

  • To make a profit, income ( revenue ) must be high than cost

Classification of cost


There are two type of costs:

  • Variable costs increase time an extra product is made

  • Fixed costs have to be paid even if no products are made

Variable costs : are costs that directly vary with the output produced or sold

  • Change in proportion to amount of output produced

  • Raw materials

  • Workers wages

  • Energy / fuel for machines

Fixed costs : are costs that do not vary with output produce or sold in the short run. They are incurred even when the output is 0 and will remain the same in the short run.. Also known as overhead costs.

  • Remain same, no matter how much businesses produces in short run

  • Rent

  • Salaries of head office workers

  • Heating and lighting

  • Insurance

Total cost = Variable cost + Fixed cost


Average cost = Total cost / Total output


Economies of scale: are factors that lead to a reduction in average costs as a business increases in size

  • Purchasing economies :

- Large firms are likely to get better discounts when buying raw materials than smaller firms

  • Marketing economies :

- The cost of advertising can be spread over more product units sold than in a small firm

- They can transport much bigger loads than smaller firms at little extra cost

  • Financial economies:

- Larger firms find it cheaper and easier to raise money

  • Managerial economies:

- Large firms can afford specialist managers which increase efficiency

  • Technical economies:

- Larger machinery is often more efficient

- Division of labour enables workers to specialise

  • Risk-bearing:

- Bigger companies can spread their risk by investing in more products and more markets


Diseconomies of scale: very large businesses may become less efficient than smaller ones leading to increased unit costs


  • Decision-making:

- A large hierarchy and bureaucracy can slow down decision-making leading to missed opportunities

  • Communication:

- Top managers may be so focused on strategy that they become separated from the firm's employees, products and customers, lead to morale

  • Diversification:

- The firm may try to do too many things at once which it might loses sight of its objectives and may need to emerge to refocus

  • Geographical:

- Head office and branched may lose touch and pull in different direction


Break even analysis : tells a business what it needs to sell to cover its costs


The Break-even Point

  • Variable + fixed costs = total costs

  • Total revenue = Quantity sold x price

total costs = sells revenue


The break-even output is the output at which total revenue equals total costs(neither a profit nor loss is made, all costs are covered).

BEF formular :


Break-even level of production = Total fixed costs/ Contribution per unit


Contribution = Selling price – Variable cost per unit  (this is the value added/contributed to the product when sold)


BEF graph :



Benefits of BEF graph:

  • Show the expected loss and profit

  • Show the break even output

  • Show the margin of safety

  • Help in decision making


Drawbacks of break even charts

  • ‘Straight line’ assumption

  • Fixed costs not always constant

  • Only concentrate on the break even point

  • Assumes that all goods produced are sold












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