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Twenty-two core economics terms, from scarcity and opportunity cost to inflation, GDP and fiscal policy, each explained in plain language with a quick example.
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Scarcity
The basic economic problem: wants are unlimited but the resources to satisfy them are limited, so choices must be made.
Opportunity cost
The value of the next best alternative given up when you make a choice. If you spend an evening studying instead of working a paid shift, the lost wages are the opportunity cost.
Factors of production
The resources used to produce goods and services:
Microeconomics vs macroeconomics
Microeconomics studies individual consumers, firms and markets. Macroeconomics studies the economy as a whole, such as growth, unemployment and inflation.
Law of demand
Other things being equal, as the price of a good rises, the quantity demanded falls, and as the price falls, the quantity demanded rises.
Law of supply
Other things being equal, as the price of a good rises, producers are willing to supply more of it.
Market equilibrium
The price at which the quantity demanded equals the quantity supplied, so there is no shortage or surplus.
Price elasticity of demand
How much the quantity demanded responds to a change in price. Demand is elastic if quantity changes by a larger percentage than price, and inelastic if it changes by a smaller percentage.
Complements and substitutes
Complements are goods used together, like printers and ink. Substitutes are goods used instead of each other, like tea and coffee.
Market failure
When a free market does not allocate resources efficiently, for example because of pollution, public goods or a lack of information.
Externality
A cost or benefit that affects a third party not involved in the transaction. Pollution is a negative externality; vaccination that protects others is a positive one.
Public good
A good that is non-excludable (you cannot stop people using it) and non-rival (one person's use does not reduce another's), such as street lighting or national defence.
Monopoly
A market with a single seller, or one firm that dominates the market, often able to charge higher prices than in a competitive market.
Gross domestic product (GDP)
The total value of all final goods and services produced in a country in a given period. It is the main measure of the size of an economy.
Economic growth
An increase in a country's real GDP over time, meaning more goods and services are being produced after adjusting for inflation.
Inflation
A sustained rise in the general price level, which reduces the purchasing power of money. Many central banks target a low, stable rate.
Unemployment
People who are able and willing to work and actively looking for a job but cannot find one.
Recession
A significant fall in economic activity. A common rule of thumb is two consecutive quarters of falling real GDP.
Fiscal policy
Government decisions about taxation and public spending used to influence the economy.
Monetary policy
Action by a central bank, mainly setting interest rates and controlling the money supply, to influence inflation and economic activity.
Interest rate
The cost of borrowing money, or the reward for saving it, expressed as a percentage per year.
Comparative advantage
A country has a comparative advantage when it can produce a good at a lower opportunity cost than another country. It explains why trade can benefit both sides.
This deck covers the core vocabulary you meet in the first year of economics, at school or in an introductory university course. It moves from basic ideas such as scarcity and opportunity cost through markets and market failure to the big macroeconomic measures. Each back gives a clear definition and, where useful, a quick everyday example. Start in Learn mode and try to give your own example before you flip each card. Then use Test mode and spaced repetition to lock the definitions in. Printing double-sided gives you cards for a quick oral quiz with a friend.
Updated October 28, 2026