Ten lessons covering microeconomics, macroeconomics and the international economy for A-level, with exam skills and interactive explorers.
A study guide to A-level Economics, not a full course or textbook. The paper structure follows the AQA 7136 page; other boards (Edexcel, OCR, WJEC) organize topics differently. Economics content is standard A-level knowledge for study, and some UK institutions are described generally. Check your own specification. Lab numbers are practice values.
['GCSE Mathematics']
Course outline
Scarcity, choice and economic method
Explain opportunity cost, positive and normative statements and the production possibility frontier.
Demand, supply and price
Use demand and supply to explain price changes and elasticity.
Market failure, externalities and government intervention
Explain externalities, public goods and policy tools.
Costs, revenue and market structures
Analyze firms' costs, profit and competition.
Labor markets, inequality and the macro model
Explain wage determination, inequality and aggregate demand and supply.
Macroeconomic objectives: growth, inflation and unemployment
Describe objectives, measures and trade-offs.
Fiscal and monetary policy
Explain how governments and central banks influence the economy.
Data skills: index numbers, real and nominal values
Work with index numbers, percentage change and real values.
Evaluation and diagrams
Draw clear diagrams and write evaluation that reaches a judgment.
International economy and exam skills
Explain trade, exchange rates, the balance of payments and AQA's papers.
Sources and curriculum note
Reviewed October 7, 2026. Confirm the specification for your board and exam year.
Read every lesson below. The interactive reader above contains the same explanations, with visual tools and quizzes.
1. Scarcity, choice and economic method
Learning goal: Explain opportunity cost, positive and normative statements and the production possibility frontier.
Economics studies how societies use scarce resources to meet unlimited wants. Scarcity forces choice, and every choice has an opportunity cost: the value of the next best alternative given up. Factors of production are land, labor, capital and enterprise.
A production possibility frontier shows the maximum combinations of two goods an economy can produce with its resources. Points inside it show unemployment or inefficiency, and points outside are unattainable now. Growth shifts the frontier outward. A bowed-out frontier shows rising opportunity cost.
A positive statement can be tested against evidence, such as 'unemployment fell last year'. A normative statement contains a value judgment, such as 'unemployment should be the first priority'. Economists use models that simplify reality with assumptions such as ceteris paribus, all else equal.
In exams, define terms, apply them to the context given, then evaluate by weighing advantages, disadvantages and assumptions.
Worked example
Classify a statement.
Can evidence test it
If yes, positive
If it has a value judgment, normative
Explain
Practice problem and solution
An economy can make 100 phones or 50 cars. Giving up 20 cars gives 40 more phones. What is the opportunity cost in phones of one car? Enter a number.
40 / 20 = 2.
Mental model: Scarcity forces choices; opportunity cost measures what is given up; PPF shows trade-offs.
Common trap: Treating a positive claim as a judgment.
2. Demand, supply and price
Learning goal: Use demand and supply to explain price changes and elasticity.
Demand falls as price rises, ceteris paribus, because of income and substitution effects. A price change moves along the curve. A change in income, tastes, related goods or population shifts the curve. Supply rises with price, and cost changes, technology and taxes shift it.
Equilibrium is where quantity demanded equals quantity supplied. Excess supply pushes price down and excess demand pushes it up. A rightward shift in demand raises price and quantity. A maximum price below equilibrium creates shortage, and a minimum price above equilibrium creates surplus.
Price elasticity of demand is the percentage change in quantity demanded divided by the percentage change in price. If the absolute value exceeds 1, demand is elastic and a price rise reduces revenue. If it is below 1, demand is inelastic and revenue rises. Income elasticity shows whether a good is normal or inferior, and cross elasticity shows substitutes and complements.
Explain with a diagram, label axes, and state the original and new equilibrium.
Worked example
Analyze a shift.
Which curve
Which direction
New price
New quantity
Practice problem and solution
Price rises 10 percent and quantity demanded falls 25 percent. What is the absolute value of PED? Enter a number.
25 / 10 = 2.5.
Mental model: Shifts differ from movements; elasticity decides revenue changes.
Common trap: Moving a curve for a price change.
3. Market failure, externalities and government intervention
Learning goal: Explain externalities, public goods and policy tools.
Market failure occurs when markets do not allocate resources efficiently. A negative externality, such as pollution, makes social cost greater than private cost, so the market produces too much. A positive externality, such as education, makes social benefit greater than private benefit, so too little is produced.
Public goods are non-excludable and non-rival, so private firms struggle to charge for them, and free riding results. Merit goods are underprovided, and demerit goods are overconsumed. Asymmetric information gives one side of the market more knowledge, as in used cars or health insurance.
Governments can use indirect taxes to raise the price of demerit goods, subsidies to encourage merit goods, tradable permits, regulation, minimum prices and direct provision. Each has costs: government failure arises from poor information, administrative cost and unintended effects.
Evaluate policies by effectiveness, cost, fairness and the size of the externality. Use data where given.
Worked example
Evaluate a tax.
Size of tax
Elasticity
Revenue
Fairness
Practice problem and solution
A good has private cost 10 and external cost 4 per unit. What is the social cost per unit? Enter a number.
10 + 4 = 14.
Mental model: Externalities and public goods cause market failure; policies have costs.
Common trap: Assuming government action always fixes the problem.
4. Costs, revenue and market structures
Learning goal: Analyze firms' costs, profit and competition.
Fixed costs do not change with output, and variable costs do. Average cost is total cost divided by output. In the short run, diminishing marginal returns make marginal cost rise. Economies of scale lower average cost as output grows, and diseconomies raise it at very large scale.
Profit is total revenue minus total cost. A firm maximizes profit where marginal cost equals marginal revenue. Normal profit covers opportunity cost, and supernormal profit is above it. Perfect competition has many firms, free entry and identical goods, so firms are price takers and earn only normal profit in the long run.
A monopoly has high barriers to entry, so it can set price above marginal cost and earn supernormal profit in the long run. Oligopoly has a few interdependent firms, and game theory describes strategic choices. Monopolistic competition has differentiated products and free entry.
Compare market structures by number of firms, barriers, products and price power. Evaluate with efficiency, innovation and consumer choice.
Worked example
Compare structures.
Number of firms
Barriers
Price power
Efficiency
Practice problem and solution
Total revenue is 500 and total cost is 380. What is the profit? Enter a number.
500 - 380 = 120.
Mental model: Profit is maximized where MC = MR; barriers to entry shape market power.
Common trap: Confusing average cost with marginal cost.
5. Labor markets, inequality and the macro model
Learning goal: Explain wage determination, inequality and aggregate demand and supply.
Labor demand is derived from demand for the product, and supply rises with the wage. Minimum wages may raise pay for some workers but reduce employment if set above equilibrium. Trade unions and monopsony power also influence wages.
Inequality can be measured with the Lorenz curve and Gini coefficient, which ranges from 0 (equal) to 1 (one person holds all). Progressive taxes take a larger share of higher incomes, and benefits redistribute. Policy involves trade-offs between equity and efficiency.
Aggregate demand is AD = C + I + G + (X - M). It shifts with consumer confidence, interest rates, government spending and exchange rates. Short-run aggregate supply shifts with costs, and long-run aggregate supply reflects productive capacity. The multiplier means an initial change in spending raises income by more: multiplier = 1 / (1 - MPC).
Use AD and AS diagrams to show inflation, growth and unemployment effects, and state what assumptions you make.
Worked example
Use the multiplier.
Find MPC
Compute 1 / (1 - MPC)
Multiply the injection
State assumptions
Practice problem and solution
MPC is 0.75 and government spending rises by 20. What is the maximum increase in income? Enter a number.
Multiplier 4, 4 x 20 = 80.
Mental model: AD is C + I + G + (X - M); the multiplier amplifies spending changes.
Common trap: Ignoring leakages when using the multiplier.
6. Macroeconomic objectives: growth, inflation and unemployment
Learning goal: Describe objectives, measures and trade-offs.
Economic growth is the rise in real GDP, GDP adjusted for inflation. Real GDP growth = (this year's real GDP / last year's) minus 1. GDP per capita divides by population. Growth can raise living standards but may harm the environment and widen inequality.
Inflation is the rate at which the price level rises, often measured by the consumer price index. Demand-pull inflation comes from excess demand, and cost-push inflation from higher costs. Inflation reduces the value of money and can hurt savers, while deflation can cut spending.
Unemployment is people willing and able to work but without a job. Types include cyclical, structural and frictional. The unemployment rate is unemployed divided by the labor force. The Phillips curve suggests a trade-off between inflation and unemployment in the short run, though its stability is debated.
Other objectives include a sustainable balance of payments and fair income distribution. Governments must weigh trade-offs among objectives.
Worked example
Calculate growth.
Find real GDP now
Find real GDP earlier
Compute change
Convert to percent
Practice problem and solution
Real GDP rises from 200 to 206. What is the growth rate in percent? Enter a number.
6 / 200 x 100 = 3.
Mental model: Growth, inflation and unemployment are measured differently and can conflict.
Common trap: Using nominal GDP as if it were real GDP.
7. Fiscal and monetary policy
Learning goal: Explain how governments and central banks influence the economy.
Fiscal policy uses government spending and taxation. A budget deficit occurs when spending exceeds revenue, and the national debt is accumulated deficits. Higher spending or tax cuts raise AD, and the opposite reduces it. Automatic stabilizers such as benefits help smooth the cycle.
Monetary policy uses interest rates, quantitative easing and forward guidance to influence spending. In the UK the Bank of England's Monetary Policy Committee sets the bank rate to meet an inflation target. Lower rates reduce saving and borrowing costs, which raises consumption and investment, but with time lags.
Supply-side policies aim to raise productive capacity: education, infrastructure, competition policy and labor market reform. They shift long-run aggregate supply right and can reduce inflation and unemployment together, although effects take years.
Evaluate policies by speed, size, side effects, and the state of the economy. Constraints include debt levels, confidence and global conditions.
Worked example
Evaluate a policy.
Time lag
Size
Side effects
Context
Practice problem and solution
A budget has spending of 900 and revenue of 840. What is the deficit? Enter a number.
900 - 840 = 60.
Mental model: Fiscal and monetary policies shift AD; supply-side policies shift LRAS; every policy has costs.
Common trap: Ignoring time lags.
8. Data skills: index numbers, real and nominal values
Learning goal: Work with index numbers, percentage change and real values.
An index number sets a base year to 100. Index = value / base value x 100. If the price index is 110, prices are 10 percent above the base year. Percentage change = (new - old) / old x 100. A percentage point change is the difference between two percentages, and is not the same as percentage change.
Nominal values are in current prices and real values adjust for inflation. Real value = nominal value / price index x 100. Real wages that fall while nominal wages rise show that prices rose faster than pay. Use real figures to compare across years.
A weighted index such as the consumer price index weights items by their share of spending. Averages hide the spread, so look at the distribution. Check the axes of a graph and the units before reading values.
In data questions quote numbers with units and time, calculate a change, and then explain what could cause it.
Worked example
Calculate a real wage.
Nominal wage
Index
Divide
State units
Practice problem and solution
A wage is 330 and the price index is 110. What is the real wage? Enter a number.
330 / 110 x 100 = 300.
Mental model: Indexes rebase to 100; real values remove inflation; percentage points differ from percent change.
Common trap: Treating a percentage point change as a percent change.
9. Evaluation and diagrams
Learning goal: Draw clear diagrams and write evaluation that reaches a judgment.
A good diagram has labeled axes, curves named, original and new equilibria marked, and arrows showing shifts. Draw it large, mention it in your text and use it to explain the change in price and quantity.
Analysis is a chain: cause leads to effect, which leads to a further effect. For example, lower interest rates reduce borrowing costs, which raises investment, so AD rises, so output and prices may rise. Each link should be explained, not only stated.
Evaluation weighs the argument. Useful angles are the size of the effect, elasticity, time period, the actions of other agents, and conditions such as the state of the economy. Short run and long run often differ. Say which factor matters most, with a reason.
A judgment is a clear conclusion that follows from your evidence, not a repeat of points. Use words such as 'overall' and 'it depends mainly on' and say what it depends on.
Worked example
Write a paragraph.
Point
Explain
Evidence
Evaluate
Practice problem and solution
A chain has 4 linked steps from cause to outcome. How many links join them? Enter a number.
4 steps have 3 links between them.
Mental model: Draw labeled diagrams, explain each link, evaluate with a clear angle, and reach a judgment.
Common trap: Stating a conclusion that the argument does not support.
10. International economy and exam skills
Learning goal: Explain trade, exchange rates, the balance of payments and AQA's papers.
Comparative advantage says countries gain from specializing in goods with the lowest opportunity cost and trading. Protection such as tariffs and quotas shields domestic industry but raises prices and may provoke retaliation.
The exchange rate is the price of one currency in terms of another. A rise in the pound makes UK exports dearer and imports cheaper, which can reduce net exports. The current account records trade in goods and services and income flows, and a deficit is financed by capital inflows.
AQA A-level Economics (7136) has three papers, each 2 hours and 80 marks, each 33.3 percent of the A-level. Paper 1 is Markets and market failure, Paper 2 is National and international economy, and Paper 3 is Economic principles and issues with 30 multiple-choice marks and 50 marks of case study questions.
Write in a chain of reasoning: define, apply, analyze with a diagram or data, then evaluate with a judgment. Use the data in the question. Check the AQA page for the current format.
Worked example
Plan an answer.
Command word
Key terms
Diagram
Judgment
Practice problem and solution
Country A gives up 2 cars per tonne of wheat and Country B gives up 3 cars per tonne of wheat. Which has the lower cost of wheat in cars, A (enter 1) or B (enter 2)? Enter a number.
A gives up fewer cars per tonne, so A has the comparative advantage in wheat.
Mental model: Trade gains come from comparative advantage; know the three papers and write chains of reasoning.