Methods and effects of government intervention in markets
Methods and effects of government intervention in markets: build the core model, apply it to evidence and qualify conclusions where outcomes depend on context.
9708 section 3.2; AS Level. Checked against Cambridge's 2026–2028 Version 2 (latest version published December 2025) and 2029 Version 1 (published September 2026). Cambridge states that neither version has significant changes affecting teaching. Always follow the syllabus for the candidate's examination year.
Before you begin
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What primarily determines how an indirect tax burden is divided between buyers and sellers?
What you will learn
- Analyse indirect taxes and who bears them
- Analyse subsidies and direct provision
- Evaluate maximum and minimum prices
- Explain buffer stock schemes
- Explain provision of information
- Use elasticity and implementation conditions to assess effects
Core model and terms
An indirect tax raises sellers’ costs or creates a tax wedge; a subsidy lowers effective production cost or price. The legal remitter does not determine the economic burden: relative demand and supply elasticities influence how much buyers and sellers bear. Direct provision can secure access, while maximum and minimum prices affect allocation only when binding.
Apply and evaluate
A buffer stock authority may buy a commodity to support a floor price and sell stocks to limit a ceiling price, but storage, administration and changing demand can make the scheme costly. Information campaigns may address knowledge gaps, yet people can respond differently. Compare the intended correction with unintended effects, enforcement and fiscal cost.
Pause and explain
Which statement best applies methods and effects of government intervention in markets?
Worked example
A unit tax is collected from sellers. Explain why consumers may still bear part of it.
Show the worked solution
- The tax raises the cost of supplying each unit
- Market price may rise and quantity fall
- Buyers bear part of the burden if the price they pay increases
Answer The tax raises the cost of supplying each unit → Market price may rise and quantity fall → Buyers bear part of the burden if the price they pay increases
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A unit tax is collected from sellers. Explain why consumers may still bear part of it.
Give me a hint
Distinguish legal payment from the change in market price and quantity.
Compare my reasoning
- The tax raises the cost of supplying each unit
- Market price may rise and quantity fall
- Buyers bear part of the burden if the price they pay increases
The tax raises the cost of supplying each unit Market price may rise and quantity fall Buyers bear part of the burden if the price they pay increases
Look for these in your work
- The tax raises the cost of supplying each unit
- Market price may rise and quantity fall
- Buyers bear part of the burden if the price they pay increases
Demand is relatively inelastic and supply relatively elastic when a tax is introduced. Which group is likely to bear more of the tax burden?
Give me a hint
Consider which side has fewer alternatives and changes quantity less.
Compare my reasoning
- Buyers respond less to a price change
- Sellers can more readily redirect supply
- A larger share is likely to be passed to buyers
Buyers respond less to a price change Sellers can more readily redirect supply A larger share is likely to be passed to buyers
Look for these in your work
- Buyers respond less to a price change
- Sellers can more readily redirect supply
- A larger share is likely to be passed to buyers
A maximum price is set below equilibrium. Explain the likely shortage and one possible non-price allocation method.
Give me a hint
A binding ceiling limits the price signal.
Compare my reasoning
- The ceiling is below equilibrium
- Quantity demanded exceeds quantity supplied
- Queues or eligibility rules may ration the limited supply
The ceiling is below equilibrium Quantity demanded exceeds quantity supplied Queues or eligibility rules may ration the limited supply
Look for these in your work
- The ceiling is below equilibrium
- Quantity demanded exceeds quantity supplied
- Queues or eligibility rules may ration the limited supply
A state offers free school meals to eligible students. Explain one benefit and one cost to consider.
Give me a hint
Link provision to access, then consider resource use.
Compare my reasoning
- Direct provision can improve access to meals
- Public resources fund the service
- Eligibility, administration and the opportunity cost of spending matter
Direct provision can improve access to meals Public resources fund the service Eligibility, administration and the opportunity cost of spending matter
Look for these in your work
- Direct provision can improve access to meals
- Public resources fund the service
- Eligibility, administration and the opportunity cost of spending matter
Common mistakes
- Treating the statutory taxpayer as the only party who bears a tax, or assuming a buffer stock has no storage or financing cost.
What can you explain now?
What primarily determines how an indirect tax burden is divided between buyers and sellers?
Compare with the explanation
The relative price responsiveness of demand and supply
The less responsive side usually has fewer ways to avoid the tax through changing quantity.
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Make it stick
Before moving on, explain the central idea in methods and effects of government intervention in markets and state one condition that could change its effect.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.