A Level Economics · Topic guide

Alternative Business Objectives and the Principal-Agent Problem

The standard assumption is that a firm maximises profit at the output where marginal cost equals marginal revenue (MC=MR).

Grades A*-E (A Level)MicroeconomicsAQAWJECEduqas

Method

  1. Recap the standard profit-maximising rule: output where MC=MR, since this is the benchmark every alternative objective is compared against.
  2. Explain the divorce of ownership from control: shareholders own a large firm but professional managers run its daily decisions, and managers typically have better information about the firm's true position, which is the source of the principal-agent problem.
  3. Explain sales revenue maximisation (Baumol): managers may prefer to maximise total revenue rather than profit, for example because their pay, status or job security is linked to firm size or sales figures, producing at the output where MR=0, a higher output and lower price than the profit-maximising output where MC=MR.
  4. Explain satisficing (Simon): managers aim for a level of profit judged 'good enough' to satisfy shareholders and avoid a takeover or dismissal, while directing remaining effort and resources towards other managerial goals such as growth, prestige projects or an easier working life.
  5. Explain managerial utility maximisation (Williamson): managers gain personal utility from perks, larger staff numbers and discretionary spending, and trade off some profit against these personal benefits, again producing a different output and spending pattern from a pure profit-maximiser.
  6. Explain the resulting agency costs borne by shareholders (lower profit, dividends or share price than a purely profit-maximising firm would deliver) and the corporate governance tools used to reduce them: performance-related pay and share options that tie managerial reward to profit or share price, stronger monitoring and reporting requirements, and the disciplining threat of a hostile takeover if a poorly run firm's share price falls too far.

Worked example

A firm faces demand P = 50 - 0.5Q and has a constant marginal cost of 10 pounds. Total revenue is TR = 50Q - 0.5Q-squared, giving marginal revenue MR = 50 - Q. Calculate the profit-maximising output and the sales revenue-maximising output, and compare the price charged at each.

  1. Find the profit-maximising output by setting MC=MR: 10 = 50 - Q, so Q = 40.
  2. Find the price at the profit-maximising output using the demand curve: P = 50 - 0.5(40) = 50 - 20 = 30 pounds.
  3. Find the sales revenue-maximising output by setting MR=0: 0 = 50 - Q, so Q = 50.
  4. Find the price at the revenue-maximising output: P = 50 - 0.5(50) = 50 - 25 = 25 pounds.
  5. Compare the two: the revenue-maximising output (50 units) is higher than the profit-maximising output (40 units), and its price (25 pounds) is lower than the profit-maximising price (30 pounds), consistent with a manager pursuing sales revenue rather than profit choosing a higher output and lower price.

Practice questions

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Q1State the profit-maximising rule for output.Show answer

Answer: A firm maximises profit at the output where marginal cost equals marginal revenue (MC=MR).

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Q2Define the principal-agent problem in one sentence.Show answer

Answer: A conflict of interest and information that arises when the owners of a firm (principals, e.g. shareholders) are separated from the managers who run it (agents), since the agents may pursue their own objectives rather than the principals' interests.

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Q3State the condition for the sales revenue-maximising output.Show answer

Answer: Output where marginal revenue equals zero (MR=0).

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Q4Who proposed the sales revenue maximisation model of the firm?Show answer

Answer: William Baumol.

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Q5Define satisficing.Show answer

Answer: A behaviour in which managers aim for a profit level that is 'good enough' to satisfy shareholders, rather than the maximum possible profit, while pursuing other managerial goals with remaining resources.

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Q6Give one mechanism used to reduce agency costs in a large firm.Show answer

Answer: Linking managerial pay to profit or the share price through performance-related pay or share options, or the disciplining threat of a hostile takeover.

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Exam-style questions

Written in the style of a A Level Economics exam paper, with a full mark scheme.

Q1[4 marks]

Explain one reason why the managers of a large public company might not aim to maximise profit.

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Q2[25 marks]

Evaluate the view that the principal-agent problem means large firms will never operate at the profit-maximising level of output.

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Free printable worksheet

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