O Level / IGCSE Economics Revision Guide (2281 / 0455)
This complete revision guide is designed for students preparing for:
It summarizes the most important concepts in the Cambridge Economics syllabus, helping students revise key topics quickly before exams.
This guide covers microeconomics, macroeconomics, and international economics.
1. The Basic Economic Problem
The basic economic problem arises because:
Human wants are unlimited
Resources are limited (scarce)
Because resources are scarce, individuals, businesses, and governments must make choices.
Every choice involves an opportunity cost, which is the next best alternative that is given up.
2. Factors of Production
Factors of production are the resources used to produce goods and services.
There are four main factors.
FactorDescriptionRewardLandNatural resourcesRentLabourHuman effortWagesCapitalMan-made resourcesInterestEnterpriseRisk-taking and organizationProfit
3. Production Possibility Curve (PPC)
The PPC shows the maximum combinations of two goods that can be produced using available resources.
Key points:
Points on the curve → efficient production
Points inside the curve → inefficient production
Points outside the curve → currently unattainable
The PPC also illustrates opportunity cost.
4. Demand and Supply
Demand
Demand refers to the quantity of a good consumers are willing and able to buy at different prices.
Law of Demand:
When price increases → demand decreases.
Supply
Supply refers to the quantity of a good producers are willing and able to sell at different prices.
Law of Supply:
When price increases → supply increases.
5. Market Equilibrium
Market equilibrium occurs when:
Quantity demanded = Quantity supplied
At equilibrium:
There is no shortage
There is no surplus
The market price becomes stable
6. Elasticity
Elasticity measures how responsive demand or supply is to changes in price or income.
Price Elasticity of Demand (PED)
PED measures how demand responds to price changes.
Formula:
PED = % change in quantity demanded ÷ % change in price
Types:
Elastic demand (PED > 1)
Inelastic demand (PED < 1)
Income Elasticity of Demand (YED)
YED measures how demand changes when income changes.
Goods can be:
Normal goods
Inferior goods
Luxury goods
Cross Elasticity of Demand (XED)
XED measures how demand for one good changes when the price of another good changes.
Substitute goods → positive XED
Complementary goods → negative XED
Price Elasticity of Supply (PES)
PES measures how supply responds to price changes.
Formula:
PES = % change in quantity supplied ÷ % change in price
7. Market Failure
Market failure occurs when the free market fails to allocate resources efficiently.
Common causes include:
Externalities
Public goods
Information failure
8. Externalities
Externalities are the side effects of economic activity on third parties.
Negative externalities
Examples:
Pollution
Noise
Traffic congestion
Positive externalities
Examples:
Education
Vaccination
Healthcare
Governments may use taxes, subsidies, and regulations to correct externalities.
9. Public Goods
Public goods have two characteristics:
Non-excludable
Non-rival
Examples include:
National defense
Street lighting
Public parks
Because of the free rider problem, governments often provide public goods.
10. Labour Market
The labour market determines wages and employment levels.
Key concepts:
Demand for labour is derived demand
Wages are determined by labour demand and supply
Factors affecting wages include:
Skills and education
Productivity
Demand for the product
11. Unemployment
Unemployment occurs when people who are willing and able to work cannot find jobs.
Types of unemployment:
Frictional unemployment
Structural unemployment
Cyclical unemployment
Seasonal unemployment
High unemployment can reduce economic growth and living standards.
12. Inflation
Inflation refers to a sustained increase in the general price level.
Types of inflation:
Demand-Pull Inflation
Caused by increased demand in the economy.
Cost-Push Inflation
Caused by rising production costs.
Inflation reduces the purchasing power of money.
13. Economic Growth
Economic growth is an increase in the production of goods and services in an economy.
It is usually measured using Gross Domestic Product (GDP).
Benefits include:
Higher living standards
More employment opportunities
Higher government revenue
However, growth may also create environmental problems.
14. International Trade
International trade involves the exchange of goods and services between countries.
Key concepts include:
Imports
Exports
Specialization
Comparative advantage
Trade allows countries to produce efficiently and access a wider range of goods.
15. Exchange Rates
An exchange rate is the price of one currency in terms of another.
Currencies may:
Appreciate (increase in value)
Depreciate (decrease in value)
Exchange rates affect imports, exports, and international competitiveness.
16. Balance of Payments
The Balance of Payments (BOP) records all economic transactions between a country and the rest of the world.
Main components:
Current account
Financial account
A country may experience a BOP surplus or deficit depending on trade and financial flows.
17. Economic Development
Economic development refers to improvements in living standards and quality of life.
Important indicators include:
GDP per capita
Human Development Index (HDI)
Literacy rates
Life expectancy
Development focuses on long-term improvements in social and economic conditions.
Final Exam Tips for O Level / IGCSE Economics
Students preparing for:
Cambridge O Level Economics 2281
Cambridge IGCSE Economics 0455
should focus on:
✔ Understanding key definitions
✔ Practicing diagram questions
✔ Applying concepts to real-world examples
✔ Practicing past exam papers
Strong conceptual understanding is the key to scoring well in Cambridge Economics exams.