One handout per topic, in plain English. Read the handout before the textbook, not after it — each one takes about five minutes and is designed to make the idea land first, so the formal version has somewhere to stick.
6 handoutsCambridge O LevelPrintableFree to copy and share
Wants are unlimited, resources are not — so every choice means giving something up.
Picture itYou have $20 and it is Friday. You can buy a cinema ticket or a takeaway, not both. Choosing the cinema does not just cost $20; it costs the meal you did not have. Economics starts by taking that ordinary feeling seriously.
Scarcity is the root of everything
Resources — land, labour, capital and enterprise — are limited, but what people want is not. That gap is scarcity, and it is why economics exists. Nothing in the subject makes sense without it.
Every choice has an opportunity cost
Opportunity cost is the next best alternative you gave up. Not the money — the thing. A government that builds a hospital gave up the school it could have built instead, and saying which alternative was sacrificed is what earns the mark.
The production possibility curve draws the trade-off
A PPC shows the maximum combinations of two goods an economy can produce. Points on the curve are efficient, inside it means resources are being wasted, and outside is currently impossible. Moving along the curve shows opportunity cost directly.
Growth shifts the whole curve outward
Better technology, more workers or more capital move the entire curve out — the economy can now produce more of both goods. That is what economic growth means in this diagram.
The bit that catches people outOpportunity cost is the next best alternative, not everything you gave up. If you could have bought a meal, a book or a bus pass, the opportunity cost is the single one you would have chosen — not all three added together.
The grown-up words
What it means
What it is called
Note
Unlimited wants, limited resources
scarcity
The basic economic problem
The next best alternative given up
opportunity cost
Name the one thing sacrificed
Land, labour, capital, enterprise
factors of production
The four resources
Maximum output combinations
production possibility curve
On = efficient, inside = waste
Getting the most from resources
efficiency
Being on the curve
Check you have got it
A government spends its budget on a new road instead of a hospital. What is the opportunity cost?
The hospital — the next best alternative that was given up.
What does a point inside the PPC show?
That resources are not being used fully or efficiently — there is unemployment or waste.
Edvia Free Resources · Economics 2281 · Topic 1 — free to copy and share
Topic 2
Allocation of resources
In a market economy, prices decide who gets what — nobody is in charge, and yet it mostly works.
Picture itNobody plans how much bread Karachi needs tomorrow. No committee decides. Yet the shops have roughly the right amount, because when bread runs short the price rises, and a higher price makes bakers bake more. Price is the signal.
Demand and supply pull in opposite directions
Demand falls as price rises — the curve slopes down. Supply rises as price rises — the curve slopes up. Where they cross is the equilibrium: the price where the amount people want to buy equals the amount firms want to sell.
Movement along versus shift of the curve
A change in the price of the good itself moves you along the curve. A change in anything else — income, tastes, population, price of other goods — shifts the whole curve. Confusing these two is the single biggest source of lost marks in the topic.
Price elasticity measures how much people care
Elastic demand means a small price change causes a big quantity change — typical of luxuries with close substitutes. Inelastic means quantity barely responds — typical of necessities and addictive goods. That is why governments tax cigarettes and fuel: the revenue holds up.
Markets sometimes fail
Market failure is when the price system produces a bad outcome: pollution that the polluter does not pay for, public goods like street lighting that nobody would buy individually, or merit goods like education that people under-consume.
The bit that catches people outAlways draw the diagram, and always label both axes and both curves, mark the original equilibrium, then show the shift with an arrow and the new equilibrium. Marks are given for the diagram itself, and an unlabelled sketch scores nothing however good the writing around it.
The grown-up words
What it means
What it is called
Note
Amount buyers want at each price
demand
Slopes down
Amount sellers offer at each price
supply
Slopes up
Where supply meets demand
equilibrium
Market-clearing price
Quantity responds a lot to price
elastic demand
Luxuries, many substitutes
Quantity barely responds
inelastic demand
Necessities, addictive goods
Price system producing a bad outcome
market failure
Pollution, public goods
Check you have got it
The price of coffee rises. Does the demand curve for coffee shift?
No — a change in the good's own price causes a movement along the curve, not a shift.
Why do governments tax cigarettes heavily?
Demand is inelastic, so quantity falls only slightly and tax revenue stays high — and it discourages a harmful good.
Edvia Free Resources · Economics 2281 · Topic 2 — free to copy and share
Topic 3
Microeconomic decision makers
Households, workers, firms and banks each make decisions — and each follows a logic you can predict.
Picture itWhy does a surgeon earn more than a shop assistant? Not because the work is more important in some moral sense — because far fewer people can do it. Supply and demand apply to labour exactly as they apply to bread.
Households decide between spending and saving
Income is either spent or saved. How much goes each way depends on income level, interest rates, confidence about the future and age. Higher earners save a larger proportion, not just a larger amount.
Wages are set by supply and demand for labour
High pay usually reflects skills that are scarce, long training, unpleasant or dangerous conditions, or strong trade unions. Low pay reflects the opposite. Government can intervene with a minimum wage, which raises pay but may reduce the number of jobs offered.
Firms grow to cut costs
As a firm gets bigger it can buy in bulk, borrow more cheaply and specialise its workers — economies of scale, which lower average cost. Grow too big and communication and coordination problems raise costs again — diseconomies of scale.
Market structures differ in competition
Perfect competition: many small firms, identical products, no power over price. Monopoly: one dominant firm, high barriers to entry, power to set price. More competition generally means lower prices and more choice; monopoly can mean higher prices but also the profits to fund investment.
The bit that catches people outEconomies of scale reduce average cost per unit, not total cost. A bigger firm spends more in total — it simply spends less per item made. Writing that costs fall, without saying 'average' or 'per unit', loses the mark.
The grown-up words
What it means
What it is called
Note
Money left after spending
saving
Rises with income
Payment for labour
wage
Set by labour supply and demand
Legal pay floor
minimum wage
Raises pay, may cut jobs
Average cost falling as output grows
economies of scale
Bulk buying, specialisation
Average cost rising as a firm gets too big
diseconomies of scale
Coordination problems
One firm dominating the market
monopoly
High barriers to entry
Check you have got it
Give two reasons a doctor is paid more than a cleaner.
The skills are scarce and take years of training, so labour supply is low, while demand for medical care is high.
Why might a monopoly charge higher prices?
There are no close competitors, so consumers cannot switch, and barriers to entry keep new firms out.
Edvia Free Resources · Economics 2281 · Topic 3 — free to copy and share
Topic 4
Government and the macroeconomy
Governments chase four goals at once — growth, low unemployment, stable prices and a healthy balance of payments — and the goals often conflict.
Picture itCut interest rates and you boost jobs and growth. You also risk inflation. Raise them to control inflation and unemployment rises. There is no setting that gives you everything, which is why economic policy is argued about rather than simply calculated.
The four macroeconomic aims
Economic growth, full employment, price stability and a balance of payments equilibrium. Also, increasingly, redistribution of income. Know that these can conflict — that conflict is what most essay questions are really about.
Two toolkits
Fiscal policy is government spending and taxation. Monetary policy is interest rates and the money supply. Expansionary versions of either boost demand; contractionary versions cool it down. Supply-side policies — training, infrastructure, deregulation — aim to raise the economy's capacity instead.
Inflation: two causes, several costs
Demand-pull inflation comes from too much spending chasing too few goods. Cost-push comes from rising costs such as wages or imported oil. The costs include falling real incomes, damaged export competitiveness and eroded savings.
Unemployment has types, and the type dictates the cure
Cyclical (low demand in a recession) needs demand stimulus. Structural (skills no longer needed) needs retraining. Frictional (between jobs) is short-term and largely unavoidable. Matching cause to policy is what a good answer does.
The bit that catches people outFiscal is tax and spending; monetary is interest rates and money supply. Students routinely swap them, which makes an otherwise correct answer wrong. Remember: fiscal starts with 'f' like 'finance ministry'; monetary starts with 'm' like 'money and the central bank'.
The grown-up words
What it means
What it is called
Note
Government spending and taxation
fiscal policy
Run by the finance ministry
Interest rates and money supply
monetary policy
Run by the central bank
Improving the economy's capacity
supply-side policy
Training, infrastructure
Too much demand pushing prices up
demand-pull inflation
Rising costs pushing prices up
cost-push inflation
Wages, imported oil
Unemployment from a recession
cyclical unemployment
Cured by boosting demand
Unemployment from outdated skills
structural unemployment
Cured by retraining
Check you have got it
Unemployment has risen because a country's textile industry has closed permanently. Which type is it, and what policy fits?
Structural unemployment. Retraining and relocation support fit; simply boosting demand will not bring those jobs back.
Name one conflict between macroeconomic aims.
Boosting growth and employment through higher demand can cause inflation — you often cannot achieve both at once.
Edvia Free Resources · Economics 2281 · Topic 4 — free to copy and share
Topic 5
Economic development
Development is more than money — it is whether people's lives are actually getting better.
Picture itTwo countries can have identical average incomes while in one people live to eighty and in the other to fifty. Income tells you part of the story. Development economics exists because the rest of the story matters just as much.
GDP measures output, not wellbeing
GDP per head is a starting point, but it ignores income distribution, unpaid work, the informal economy, environmental damage and quality of life. A country can grow while most of its people get no better off.
The HDI adds two more dimensions
The Human Development Index combines income with life expectancy (a proxy for health) and education. It is still crude, but a country that scores well on all three is genuinely developing, not just producing more.
Population structure shapes the problem
Developing countries often have high birth rates and a young population — many dependants per worker, and heavy pressure on schools. Developed countries face the opposite: ageing populations, pension costs and shrinking workforces.
Poverty has causes that reinforce each other
Low income means low saving, which means low investment, which means low productivity, which means low income again. Breaking that cycle usually needs outside investment, education, better infrastructure and stable institutions.
The bit that catches people outGrowth and development are not the same word. Growth is an increase in output. Development is an improvement in living standards. A country can grow while inequality worsens, pollution rises and most people are no better off — so growth without development is entirely possible.
The grown-up words
What it means
What it is called
Note
Total output per person
GDP per head
A starting point, not the whole story
Income, health and education combined
Human Development Index
A broader measure
An increase in output
economic growth
Not the same as development
Improvement in living standards
economic development
Broader than growth
People not of working age
dependants
Children and the elderly
Low income → low saving → low investment
poverty cycle
Self-reinforcing
Check you have got it
Why is GDP per head an incomplete measure of living standards?
It ignores how income is distributed, unpaid and informal work, environmental damage, and health and education outcomes.
Give one problem caused by a very young population.
A high dependency ratio — few workers supporting many children — and heavy pressure on schools and healthcare.
Edvia Free Resources · Economics 2281 · Topic 5 — free to copy and share
Topic 6
International trade and globalisation
Countries trade because they are good at different things — and specialising makes both sides better off, in theory.
Picture itPakistan exports textiles and imports machinery. It could try to make everything itself, and it would be poorer for it. Trade lets each country do what it does relatively best and swap for the rest.
Specialisation and the gains from trade
If one country produces cloth more cheaply and another produces machinery more cheaply, both gain by specialising and trading. The result is more total output than either could achieve alone.
Protectionism and why it happens
Tariffs (taxes on imports), quotas (limits on quantity) and subsidies to domestic firms all restrict trade. Governments use them to protect infant industries, save jobs, or respond to dumping — but they raise prices for consumers and invite retaliation.
The exchange rate changes everything
If a currency depreciates, exports become cheaper abroad and imports more expensive at home — good for exporters, bad for anyone buying imported goods or fuel. An appreciation does the reverse.
Balance of payments records the flows
The current account records trade in goods and services. A deficit means importing more than exporting, which may be financed by borrowing or investment inflows. Persistent large deficits are usually a problem; small ones need not be.
Globalisation cuts both ways
Multinationals bring investment, jobs and technology, but may repatriate profits, exploit weak labour laws and out-compete local firms. A good answer gives both sides and then reaches a judgement.
The bit that catches people outWhen a currency depreciates, exports get cheaper and imports get dearer. Many students get this backwards. Anchor it: a weaker rupee means foreigners need fewer of their own currency to buy your goods — so your exports look cheap to them.
The grown-up words
What it means
What it is called
Note
Tax on imports
tariff
Raises import prices
Physical limit on imports
quota
Restricts quantity
Restricting trade to protect home firms
protectionism
Invites retaliation
Currency falling in value
depreciation
Exports cheaper, imports dearer
Record of trade in goods and services
current account
Part of the balance of payments
Importing more than exporting
trade deficit
Check you have got it
A country's currency depreciates. What happens to its exports and imports?
Exports become cheaper for foreign buyers so they tend to rise; imports become more expensive so they tend to fall.
Give one argument for and one against a tariff on imported steel.
For: it protects domestic steel jobs from cheaper foreign competition. Against: it raises costs for every industry that uses steel, and other countries may retaliate.
Edvia Free Resources · Economics 2281 · Topic 6 — free to copy and share
Like how this is taught?
Every handout starts with the idea in plain English and only then the formal version. That is how every class at Edvia College works — for two full years of Cambridge A Levels.