The concept of economies and diseconomies of scale

Economies of scale occur when a firm expands its production, leading to a reduction in the average cost per unit. This happens because certain costs can be spread more thinly over a larger output. However, if a firm grows too large, it may face diseconomies of scale, where average costs start to rise due to inefficiencies.

Economies and diseconomies of scale

Economies of scale are the financial benefits, such as falling average costs, that come from producing goods or services on a very large scale. Diseconomies of scale are the increase in average costs that occurs when a firm becomes excessively large and inefficient.

How average costs change with firm size

As a business grows, its average costs typically decrease up to a certain point due to economies of scale. Beyond this optimal size, costs may rise because of diseconomies.

Large firms often produce goods more cheaply than small ones because they can exploit these cost reductions. However, continuing to expand beyond the optimal point can lead to inefficiencies.

Internal economies of scale

Internal economies of scale are cost advantages that a specific firm gains as it grows larger. These benefits arise from changes within the business itself, allowing it to operate more efficiently and reduce average costs per unit.

Types of internal economies of scale

• Purchasing economies:
  • Bigger firms can buy materials in bulk, securing discounts from suppliers.
  • This lowers the cost per unit for raw materials or components.
• Marketing economies:
  • Large businesses spread fixed advertising costs over more units, reducing the average cost.
  • They can also manage their own distribution more efficiently than relying on external services.
• Technical economies:
  • Expansion allows investment in advanced equipment and greater specialisation.
  • Larger facilities are often more efficient, with machinery used more intensively.
• Financial economies:
  • Bigger firms access loans at lower interest rates and can raise funds through share sales.
  • Banks view them as lower risk, offering better terms.
• Managerial economies:
  • Growth enables hiring of specialist staff for roles like finance or operations.
  • This improves efficiency compared to one person handling multiple tasks in a small firm.
• Risk-bearing economies:
  • Larger firms diversify across products and markets, spreading risk.
  • If one area underperforms, others can compensate.

External economies of scale

External economies of scale provide cost benefits to all firms in an industry when the sector as a whole expands, often in a concentrated geographic area. These advantages come from outside individual businesses but lower costs across the industry.

Types of external economies of scale

• Skilled labour:
  • Industry growth creates a pool of experienced workers, cutting training costs.
  • Local colleges may offer tailored courses to meet demand.
• Infrastructure:
  • Dominant industries attract specialised facilities like transport or utilities.
  • This supports efficient operations for everyone in the area.
• Ancillary and commercial services:
  • Specialist suppliers and services emerge to support the industry.
  • Firms gain access to nearby providers for maintenance, distribution, or banking.
• Cooperation:
  • Nearby firms collaborate, sharing resources like research facilities.
  • This reduces individual costs through joint efforts.