Indirect taxes and subsidies — Edexcel A-Level Economics A
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Indirect taxes and subsidies explained
This topic applies supply and demand analysis and elasticity concepts to indirect taxes and subsidies.
Read the full explanation
An indirect tax shifts the supply curve upward by the tax per unit; the new equilibrium has a higher price and lower quantity. The incidence—how the tax burden is shared—depends on the relative price elasticities of demand and supply. Consumers bear more if demand is inelastic relative to supply; producers bear more if supply is inelastic relative to demand. The government receives tax revenue equal to the tax per unit multiplied by the new quantity. A subsidy shifts supply downward; consumers pay less and quantity rises. The government pays the subsidy, and the benefit is shared between consumers and producers according to elasticities, split by the original equilibrium price.
Your focus
- Explain how an indirect tax affects consumers, producers and government using supply and demand analysis.
- Analyse how the incidence of an indirect tax is determined by relative price elasticities of demand and supply.
- Illustrate and interpret the areas representing producer subsidy and consumer subsidy on a supply and demand diagram.
Indirect taxes and subsidies exam tips
Marking Points
- An indirect tax shifts the supply curve vertically upward by the amount of the tax per unit.
- The incidence of an indirect tax on consumers and producers depends on the relative price elasticities of demand and supply.
- Consumers bear a larger share of an indirect tax when demand is relatively inelastic compared with supply.
- Producers bear a larger share of an indirect tax when supply is relatively inelastic compared with demand.
- Government revenue from an indirect tax equals the tax per unit multiplied by the quantity sold after the tax.
- A subsidy shifts the supply curve vertically downward by the amount of the subsidy per unit.
- The benefit of a subsidy is shared between consumers and producers according to relative elasticities.
- The producer subsidy area on a diagram is the rectangle bounded by the price received by producers (Pp) and the original equilibrium price (P0), multiplied by the new quantity (Q1).
- The consumer subsidy area on a diagram is the rectangle bounded by the original equilibrium price (P0) and the price paid by consumers (Pc), multiplied by the new quantity (Q1).
Examiner Tips
- 💡Always label the axes and curves clearly on diagrams; show the tax or subsidy per unit as a vertical distance.
- 💡Use elasticity values or descriptions to explain the split of incidence; state which side is relatively more elastic.
- 💡For subsidy area questions, identify the original equilibrium price (P0), the price received by producers (Pp), and the price paid by consumers (Pc). The consumer subsidy is (P0 - Pc) multiplied by Q1, and the producer subsidy is (Pp - P0) multiplied by Q1.
- 💡Check that your answer covers consumers, producers and government for both taxes and subsidies.
Common Mistakes
- Misunderstanding: the tax is always paid entirely by consumers. Correction: the incidence depends on relative elasticities; if demand is perfectly elastic, producers bear the full tax.
- Misunderstanding: a subsidy shifts the demand curve. Correction: a subsidy shifts the supply curve downward by the subsidy per unit.
- Misunderstanding: government revenue from a tax is tax per unit multiplied by the original quantity. Correction: revenue is tax per unit multiplied by the new equilibrium quantity after the tax.
- Misunderstanding: the producer subsidy area is the entire subsidy rectangle. Correction: the producer subsidy area is only the portion bounded by the price received by producers and the original equilibrium price, multiplied by the new quantity.