3.1.1 - Sizes and types of firms

Measuring Firm Size

Before judging whether a firm is large or small, it helps to ask what measure is being used. A firm can be large in one sense and small in another, so size is not a single obvious fact.

That is why exam answers should avoid saying one measure is always best. A supermarket chain may look large by turnover and market share, while a manufacturer may look larger by capital employed, and a labour-intensive service firm may look larger by employment.

Why Firms Grow

Growth is attractive when getting larger makes a firm cheaper to run, more profitable, or harder to challenge. A firm that expands into more products or markets can also spread risk more effectively than a business that relies on one narrow source of revenue.

Economies of scale are the clearest incentive to grow. A larger firm can spread fixed costs over more units, negotiate bulk discounts from suppliers, and use specialist labour and machinery. That lowers average cost, which either increases profit margins or allows the firm to cut price and compete more aggressively.

Growth also raises total revenue if the firm sells more output in more places. If sales rise while average costs fall, profits can increase strongly. A larger firm may then gain market power, so it has more influence over price and can make entry harder for rivals. On the buying side, a very large firm may gain monopsony power and push down the prices it pays to suppliers. In the UK grocery market, Tesco and the other major supermarket chains can negotiate wholesale terms that a small independent shop could not secure. That power can be abused: in 2016 the Groceries Code Adjudicator found that Tesco had deliberately delayed payments to suppliers to improve its own financial position.

Size can also create security. Large firms often hold more assets and cash reserves, and many operate across several products, regions, or customer groups. If one market weakens, the rest of the business may protect the firm from a more serious financial shock.

Why Some Firms Stay Small

The advantages of size do not mean every firm should grow. Some businesses remain small because their market is limited, while others stay small because growth would be too risky or too expensive.

A niche market may simply be too small to support a large-scale producer. A bespoke tailor, specialist craft producer, or local professional practice may serve a loyal but limited customer base. Expanding too far could mean moving into a broader market where the firm's specialist advantage is weaker.

Access to finance is another major constraint. Expansion usually needs new premises, equipment, stock, marketing, or staff. Small firms often find borrowing difficult because they have less collateral, a shorter trading record, and fewer ways to raise external finance. This is why a finance gap can stop a potentially successful firm from scaling up.

Owner objectives matter as well. Some owners prefer independence, personal control, and work-life balance to faster growth. Expanding may mean taking on debt, delegating authority, and accepting more risk. Regulation can also slow growth, because planning rules, employment requirements, and industry-specific regulation often become more demanding as a firm gets bigger. For example, UK employers with 250 or more staff must publish their gender pay gap every year.

Ownership and Control

In a small owner-managed firm, the owner usually makes the key decisions. In a large public limited company, that changes. Shareholders own the business, but managers run it. This separation is the divorce of ownership from control.

Shareholders appoint directors and can vote on important issues at the AGM, so they are not powerless. A falling share price also puts pressure on the board. However, shareholders are usually numerous and distant from day-to-day decisions, while managers have much more information about what is happening inside the business. That creates scope for conflict.

Instead of aiming for pure profit maximisation, managers may profit satisfice. In other words, they may seek profits that are high enough to keep shareholders reasonably content while also pursuing their own objectives, such as higher salaries, job security, status, or a quieter working life. This can lead to empire-building, overstaffing, unnecessary perks, avoidance of risky but profitable projects, or a focus on short-term results that make current performance look stronger than it really is.