Economies and diseconomies of scale

Economies of Scale

As a business grows and increases its output, it often benefits from economies of scale — reductions in the average cost per unit produced. This is one of the most powerful advantages of size: larger businesses can produce goods more cheaply per unit than smaller ones, giving them a competitive advantage through lower prices or higher margins.

Average Unit Cost

Average unit cost = Total costs ÷ Number of units produced

Worked example: A factory producing 10,000 units with total costs of £50,000 has an average unit cost of £5.00. If it expands to produce 20,000 units and total costs rise to £80,000 (fixed costs spread over more units): average unit cost = £80,000 ÷ 20,000 = £4.00. The business is now producing more cheaply per unit.

Types of Economies of Scale

• Purchasing economies — larger businesses buy raw materials, components and supplies in greater volumes. Suppliers offer bulk discounts to secure large, reliable orders. The cost per unit of input therefore falls as the business grows. A large supermarket chain, for example, can negotiate far lower prices from food manufacturers than a small independent shop.
• Technical economies — larger businesses can invest in more advanced, automated, or specialised machinery and technology that smaller businesses cannot justify. This equipment produces output faster and more cheaply per unit. A large car manufacturer can afford fully automated production lines that a small assembler cannot.
• Other economies (students should be aware of these even if not named in the AQA spec): managerial economies (specialist managers can be employed as the business grows), financial economies (larger businesses can borrow at lower interest rates), and marketing economies (advertising costs spread over more units).

Diseconomies of Scale

Growth does not always reduce costs — beyond a certain size, a business may find that average unit costs begin to rise as it grows further. These are diseconomies of scale. They arise because very large organisations become harder to manage effectively.

AQA identifies three main causes of diseconomies of scale:

• Poor communication — as a business grows, messages must travel through more management layers and across more teams. Information is slower to reach the right people, more likely to be distorted, and harder to act upon quickly. Decisions that a small business makes in minutes can take weeks in a large organisation.
• Coordination issues — managing thousands of employees across multiple sites, departments, and functions becomes increasingly complex. Ensuring all parts of the business work together effectively requires significant management resource, and failures of coordination become more likely and more costly.
• Reduced staff motivation — employees in very large organisations often feel like a small cog in a vast machine. They may feel less valued, less connected to the business's success, and have fewer opportunities for recognition than in smaller firms. Lower motivation leads to reduced productivity, higher absenteeism, and greater staff turnover — all of which increase costs.

The point at which diseconomies begin to outweigh economies of scale varies by industry. Capital-intensive manufacturers can often grow very large before diseconomies bite; service businesses that depend heavily on human relationships and communication may encounter them earlier.