Do firms always aim to maximise profit

• →Profit maximisation occurs where a firm produces at the output level at which marginal cost equals marginal revenue (MC = MR), generating the greatest possible difference between total revenue and total costs.
• →This is the central assumption of the traditional theory of the firm. However, this assumption may not always hold in practice.
• →In large firms where ownership and control are separated (the principal-agent problem) managers may pursue objectives that serve their own interests rather than those of shareholders. This means that a manager whose remuneration is tied to revenue may instead pursue sales revenue maximisation, producing at the output where MR = 0, which results in a higher output and lower price than under profit maximisation. As a result, shareholders' returns are reduced relative to what they could be.
• →Furthermore, firms operating in markets where generating market share is important, such as Amazon in its early years, may deliberately sacrifice short-run profit in order to undercut rivals and deter entry, pursuing a sales maximisation objective (AC=AR) instead.
• →The profit maximisation assumption is further undermined in oligopolistic markets, where firms may collude or engage in non-price competition in ways that do not produce an MC = MR outcome.
• →Profit maximisation assumption holds in highly competitive markets where firms that do not minimise costs and maximise profit will be driven out by market forces, suggesting the profit maximisation is important but depends heavily on market structure and business objectives.

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This diagram shows all three objectives on a single MR/MC/AC/AR framework. Profit maximisation occurs at Qpmax where MC = MR, giving the highest price Ppmax. Revenue maximisation occurs at Qrmax where MR = 0, with price Prmax. Sales maximisation (subject to normal profit) occurs at Qsmax where AR = AC, giving the lowest price Psmax and highest output. Students must be able to identify all three output levels and their corresponding prices, and explain why a firm might choose each objective over the others.

• →The principal-agent problem: When ownership and control are separated in large firms, managers (agents) may pursue objectives — such as revenue maximisation or expense preference — that diverge from profit maximisation on behalf of shareholders (principals).
• →Alternative managerial objectives: Baumol's sales revenue maximisation (output where MR = 0), Marris's growth maximisation, and Williamson's managerial utility maximisation all produce different output and price outcomes compared with profit maximisation (MC = MR).
• →Satisficing: Behavioural theories, particularly associated with Simon and Cyert and March, suggest that firms aim for a satisfactory rather than maximum level of profit, balancing the competing demands of multiple internal stakeholders.
• →Market structure as a constraint: In highly competitive markets, the discipline of competition forces firms toward cost-minimising, profit-maximising behaviour; the profit maximisation assumption is therefore more credible in competitive markets than in oligopolies or monopolies where managers have more discretion.
• →Short-run versus long-run profit maximisation: Some apparent deviations from profit maximisation — such as limit pricing or predatory pricing — may actually represent long-run profit maximising strategies rather than genuinely different objectives.

This question tests understanding of the objectives of firms and the validity of the profit maximisation assumption as a behavioural model of firm conduct. It requires students to evaluate the standard neoclassical assumption against managerial and behavioural theories, drawing on the principal-agent problem, market structure, and the relationship between ownership and control. This maps to Edexcel spec point 3.2.1.a (which covers firm objectives and the conditions under which they operate) and AQA spec point 4.1.5.2 — The objectives of firms, both of which require students to move beyond the simple assumption that firms always set MC = MR.

Examined 3 times across AQA and Edexcel since 2019.

The topic has appeared on both boards and at a range of tariffs, confirming it is treated as a substantive area of the specification rather than a peripheral one.

• →Business Objectives — provides the foundational framework of alternative firm objectives (revenue maximisation, growth, satisficing) that underpin any evaluation of whether profit maximisation is a valid assumption.