A-Level Economics: Competition Policy and Regulation

Market power is one of the market failures every A level Economics specification asks you to analyse, and the policies used to control it are a favourite topic for data-response questions and 25-mark essays. This material works through the whole policy toolkit, from the reason intervention is needed to the reasons it can go wrong.

It starts with the diagnosis. A profit-maximising monopolist sets price above marginal cost, restricts output and creates a deadweight welfare loss; sheltered from rivals, it may also suffer from X-inefficiency. You calculate a deadweight loss triangle in pounds and separate it from the supernormal profit that is merely a transfer from consumers to the firm.

Next comes competition policy. The Competition and Markets Authority (CMA) reviews mergers, tackles cartels and abuse of a dominant position, and investigates markets that work badly for consumers. A horizontal merger scenario asks you to weigh the cost savings from economies of scale against the higher prices and reduced choice that greater market power can bring, which is the core judgement in any merger case.

The regulation section covers the utilities. You apply CPI − X price caps and CPI + K formulas to numerical examples and explain why a positive K is used to fund investment. You compare price caps with rate-of-return regulation and its gold-plating incentive, and analyse the natural monopoly dilemma: marginal cost pricing is allocatively efficient but makes the firm run at a loss, while average cost pricing covers costs. Performance targets and the work of sector regulators such as Ofgem and Ofwat appear in the written tasks.

Ownership and contestability complete the picture: the arguments for and against privatisation and nationalisation, deregulation, and the role of sunk costs as a barrier to entry. Finally, the limits of regulation are treated as government failure: regulatory capture, asymmetric information about costs and unintended consequences.

The material offers a 12-question quiz with explanations, a flashcard deck of key terms and definitions, a printable written sheet of eight analytical and evaluative questions with model answers, and an oral exam in which an examiner asks you to explain and evaluate these policies one question at a time. Where boards differ in emphasis, the content follows what they share; for example, AQA places this topic under competition policy and the regulation of markets, while Pearson Edexcel treats it in Theme 3 under government intervention.

• Explain why monopoly power causes allocative inefficiency, deadweight loss and X-inefficiency
• Describe the main functions of the Competition and Markets Authority, including merger control
• Calculate allowed price changes under CPI − X and CPI + K price caps
• Compare price-cap and rate-of-return regulation and the natural monopoly pricing dilemma
• Evaluate privatisation, nationalisation and deregulation as responses to market power
• Analyse regulatory capture and asymmetric information as causes of government failure

Practice material written by Zestly, based on the DfE GCE A level economics subject content (2014), area 'Market failure and government intervention: market power', with examples drawn from the AQA (competition policy; public ownership, privatisation, regulation and deregulation) and Pearson Edexcel (Theme 3, government intervention) specifications.