4.2 - Subsidies - notes
4.2 - Subsidies
What subsidies are and why governments provide them
Subsidies are payments made by the government to producers or consumers to encourage certain economic activities.
Reasons governments provide subsidies:
- Promoting goods with positive externalities - Subsidies encourage the production and use of merit goods.
- Reducing negative externalities - They support alternatives that lessen harmful effects, for example, subsidising public transport.
- Boosting international competitiveness - Subsidies can help domestic firms grow and compete globally.
- Direct support to consumers - In some cases, subsidies are given straight to buyers rather than producers.
The effects of subsidies on markets
When the government provides a subsidy to producers, it reduces their costs, leading to an increase in supply. This shift affects prices, quantities, and benefits for both producers and consumers.
How subsidies shift the supply curve
- A subsidy causes the supply curve to shift to the right.
- This results in a lower market price for consumers and a higher quantity supplied and demanded.
Distribution of subsidy benefits in a market diagram
In a supply and demand diagram:
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On the diagram, the original equilibrium is at point U, where the demand curve D meets the initial supply curve S, giving price P and quantity Q.
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The subsidy lowers producers' costs, so the supply curve shifts right from S to S₁ - the vertical gap between the two curves is the subsidy per unit. The new equilibrium is at point V, where D meets S₁, giving a lower price P₁ and a higher quantity Q₁.
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Consumers pay the lower price P₁, while producers receive a higher effective price of P₂ - read off the original supply curve S at the new quantity Q₁, which is point T.
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The total cost of the subsidy to the government is the rectangle VTP₂P₁: the subsidy per unit (the gap from P₁ up to P₂) multiplied by the new quantity Q₁.
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Both consumers and producers benefit. Consumers gain from the fall in price from P to P₁ (area VUPP₁), and producers gain from the rise in the price they receive from P to P₂ (area UTP₂P).
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The share of benefits between consumers and producers depends on the price elasticity of demand and supply.
Other market impacts of subsidies
- Price and quantity changes - The price drops from P to P₁, and quantity rises from Q to Q₁.
- Elasticity considerations - The proportion of the subsidy producers and consumers benefit from depends on the elasticity of the supply and demand curves.
Advantages of subsidies
- Internalises the benefits of positive externalities by covering part of the costs, leading to lower prices for goods that benefit society.
- Changes behaviour by encouraging producers to supply and consumers to buy merit goods, making them more affordable and increasing demand.
- Maintains positive externalities, such as reduced pollution from subsidised renewable energy sources like wind farms.
- Helps domestic industries grow until they achieve economies of scale and compete internationally.
Disadvantages of subsidies
- Difficult to accurately value the monetary benefit of positive externalities.
- Opportunity cost - funds used for subsidies could be allocated to other priorities.
- Can make producers inefficient and dependent on government support, reducing incentives to cut costs or innovate.
- Effectiveness varies with demand elasticity - subsidies have limited impact on goods with inelastic demand.
- Subsidised domestic goods may be lower quality than unsubsidised imports, potentially harming consumer choice.