Why firms grow — and economies of scale
Firms grow mainly to gain economies of scale — falling unit costs from bulk-buying, technical, managerial, financial and marketing advantages.
Businesses grow for several reasons: to cut unit costs (economies of scale), gain market power and brand strength, earn higher profit, spread risk across markets, and satisfy managerial ambition. Growth is either organic (internal expansion) or inorganic (mergers/takeovers).
The biggest prize is economies of scale — the fall in unit (average) cost as output rises. Internal economies (from the firm's own growth) include:
- Purchasing (bulk-buying) — buying materials in bulk at a discount → lower cost per unit.
- Technical — using larger, more efficient machinery/processes that only high output justifies.
- Managerial — affording specialist managers (finance, marketing) whose expertise raises efficiency.
- Financial — larger firms borrow more cheaply (seen as lower-risk by lenders) and access more finance.
- Marketing — spreading advertising and marketing costs over more units → lower marketing cost per unit.
External economies come from the industry growing (e.g. a skilled local labour pool, specialist suppliers nearby).
The effect: economies of scale lower the unit cost, letting a large firm cut prices or enjoy higher margins — a powerful competitive advantage over smaller rivals.
- Firms grow for economies of scale, market power, profit and to spread risk.
- Internal economies: purchasing, technical, managerial, financial, marketing.
- External economies come from the whole industry growing.
- Economies of scale lower unit (average) cost.
- Lower unit cost → lower prices or higher margins → competitive advantage.