Market Failure Case Studies: Sugar Tax, CAP and EU ETS

Market Failure Case Studies: Quick Answer

Strong market-failure examples do more than name a policy. Identify the original market failure, explain how the intervention changes incentives or prices, trace the likely welfare effect and evaluate the outcome using evidence, elasticities, enforcement and unintended consequences.

Case study	Market failure	Policy mechanism
UK Soft Drinks Industry Levy	Demerit consumption and possible health-related external costs	A tiered levy changes producer incentives and may encourage reformulation
Agricultural price support	Income instability and food-security objectives	Price support changes producer revenue but may create surplus and fiscal costs
EU Emissions Trading System	Negative production externalities from greenhouse-gas emissions	A cap and tradable allowances create a carbon price

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To build stronger answers (Level 5) in A-Level or IB Economics essays, you cannot rely on generic, hypothetical examples like "a widget factory polluting a river." Examiners want to see that you understand how economic theory applies to the real world.

Here are three essential, real-world case studies of market failure that you can use in almost any essay regarding government intervention, externalities, or imperfect information.

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1. Demerit Goods & Indirect Taxes: The UK Sugar Tax

The Economic Problem: Over-consumption of demerit goods (sugary drinks) leading to negative externalities of consumption (e.g., increased healthcare costs for the NHS, lost productivity due to illness).

The Policy: In 2018, the UK government introduced the Soft Drinks Industry Levy (SDIL). It charged manufacturers 24p per liter on drinks containing 8g of sugar per 100ml, and 18p per liter on drinks with 5-8g of sugar.

Evaluation Points to use in an essay: - Success: It forced firms to reformulate. Over 50% of manufacturers reduced the sugar content of their drinks *before* the tax even took effect to avoid paying it. This proves that indirect taxes can be highly effective in changing producer behavior. - Limitation (PED): The demand for sugary drinks is often price inelastic because they are habit-forming. Therefore, passing the tax onto consumers in the form of higher prices might not significantly reduce the quantity demanded. - Limitation (Regressive): Indirect taxes are regressive. This tax took a larger percentage of income from low-income households than high-income households.

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2. Minimum Prices & Agriculture: The EU Common Agricultural Policy (CAP)

The Economic Problem: Price volatility in agricultural markets. Because agricultural goods have a highly inelastic demand and supply is subject to weather shocks, farmers experience massive fluctuations in income.

The Policy: Historically, the EU used the Common Agricultural Policy (CAP) to set a minimum price (price floor) above the free market equilibrium for goods like butter and milk, guaranteeing a stable income for farmers.

Evaluation Points to use in an essay: - Success: It achieved its goal of ensuring food security in Europe and stabilizing farmer incomes, preventing mass bankruptcies during bad harvest years. - Government Failure: Setting a minimum price above equilibrium guarantees a surplus (excess supply). The EU was forced to buy this surplus, resulting in infamous "butter mountains" and "wine lakes". This represented a massive opportunity cost of government funds that could have been spent on education or infrastructure. - Global Impact: To get rid of the surplus, the EU often dumped it on developing nations at artificially low prices, destroying the livelihoods of farmers in those poorer countries.

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3. Negative Externalities of Production & Cap-and-Trade: The EU ETS

The Economic Problem: Firms emit greenhouse gases (pollution) into the atmosphere without paying for the environmental damage they cause, resulting in a negative externality of production. The free market over-allocates resources to polluting industries.

The Policy: The EU Emissions Trading System (ETS) is the world's largest carbon market. The government issues a limited number of "permits to pollute." Firms can buy and sell these permits.

Evaluation Points to use in an essay: - Success: It internalizes the externality. Firms that pollute heavily face high costs (buying permits), giving them a massive financial incentive to invest in green technology. - Limitation (The Cap): In the early years of the ETS, the EU issued too many permits. Because supply was so high, the price of a permit crashed to nearly zero, completely eliminating the incentive for firms to reduce emissions. - Limitation (Global Competition): If the EU strictly enforces this policy, European firms face higher costs than their international rivals. This could lead to a loss of international competitiveness and cause firms to relocate to countries with looser environmental laws (pollution havens).

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By memorizing these three case studies, you will always have high-level evaluation points ready for any essay on government intervention. Use them to prove to the examiner that you understand the real-world complexities of economic policy!