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Your maths questions, answered

Clear explanations for the questions that slow you down, with every step of the working shown.

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1 Basic economic ideas and resource allocation

How Does a Production Possibility Curve Work?

Learn how a production possibility curve shows scarcity and opportunity cost, what points on or inside it mean, and when the whole curve shifts for A Level Economics.

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1 Basic economic ideas and resource allocation

Merit Goods vs Demerit Goods: What’s the Difference?

Understand merit goods vs demerit goods: how imperfect information leads to under-consumption or over-consumption, with clear examples and an exam tip.

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1 Basic economic ideas and resource allocation

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Market, Planned and Mixed Economies: The Difference

Learn how market, planned and mixed economies differ in who makes decisions and how resources are allocated, with a clear example for A Level Economics students.

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1 Basic economic ideas and resource allocation

What Is a Public Good in Economics?

Understand public goods in Cambridge International AS Level Economics: non-excludability, non-rivalry, free riders and why markets may fail to provide them.

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1 Basic economic ideas and resource allocation

What Is Opportunity Cost? Example Explained

Learn what opportunity cost means in A Level Economics, why scarcity creates choices, and how to identify the next best alternative with clear examples.

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2 The price system and the microeconomy

How Do You Calculate Price Elasticity of Demand?

Learn how to calculate price elasticity of demand using percentage changes, follow a worked example, and interpret the sign and size of your PED answer.

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1 Basic economic ideas and resource allocation

Positive vs Normative Statements in Economics

Learn how to distinguish positive and normative statements in economics, test claims against evidence and avoid a common Cambridge AS and A Level exam mistake.

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1 Basic economic ideas and resource allocation

What Are the Four Factors of Production?

Learn the four factors of production in AS Level Economics: land, labour, capital and enterprise, with clear definitions, rewards and a bakery example.

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2 The price system and the microeconomy

Consumer Surplus vs Producer Surplus: What's the Difference?

Learn the difference between consumer surplus and producer surplus with a simple example and the areas to identify on an A Level demand and supply diagram.

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1 Basic economic ideas and resource allocation

Why Can't the Free Market Provide Public Goods?

Learn why the free-rider problem makes public goods difficult to fund in a free market, with a flood barrier example and the key A Level exam distinction.

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2 The price system and the microeconomy

Why Is the Demand Curve Downward Sloping?

Learn why a demand curve usually slopes downward, how a lower price changes quantity demanded, and why a price change moves along rather than shifts the curve.

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2 The price system and the microeconomy

Perfect Competition vs Monopoly: What's the Difference?

Compare perfect competition and monopoly in A Level Economics: price control, entry barriers, long-run profit and efficiency, with a key exam mistake explained.

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2 The price system and the microeconomy

How Do Indifference Curves and Budget Lines Work?

Learn how indifference curves show preferences and budget lines show what consumers can afford, with a worked example and a common A Level exam mistake.

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2 The price system and the microeconomy

What Is Diminishing Marginal Utility?

Learn what diminishing marginal utility means in A Level Economics, with a simple worked example and the key difference between marginal and total utility.

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2 The price system and the microeconomy

What Are the Types of Market Structure in Economics?

Learn the main types of market structure in economics, from perfect competition to monopoly, and compare firms, products, entry barriers and information.

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2 The price system and the microeconomy

What Factors Affect Price Elasticity of Supply?

Learn what affects price elasticity of supply, from spare capacity and stocks to production time and resources, with a clear example for A Level Economics.

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2 The price system and the microeconomy

What Is the Prisoner's Dilemma in Economics?

Learn how the prisoner's dilemma explains why rival firms may undercut each other despite higher joint profits from collusion, using a simple pay-off matrix.

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2 The price system and the microeconomy

What Is Price Discrimination? The Three Degrees

Learn what price discrimination means, how its first, second and third degrees differ, and the conditions and consequences to explain in A Level Economics.

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2 The price system and the microeconomy

How Do You Calculate Economies of Scale?

Learn how to calculate economies of scale by comparing average cost at two output levels, with a worked example and the key long-run distinction for exams.

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2 The price system and the microeconomy

How Does the Kinked Demand Curve Explain Oligopoly Pricing?

Learn how rival responses create a kinked demand curve, why a gap in marginal revenue can keep oligopoly prices stable, and what the model cannot explain.

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3 Government microeconomy intervention

How Do Subsidies Affect Market Equilibrium?

Learn how a producer subsidy shifts supply, lowers the price buyers pay and raises equilibrium quantity, with a worked example and a common exam mistake to avoid.

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2 The price system and the microeconomy

Why Do Firms Produce Where MC Equals MR?

Learn why a profit-maximising firm produces where marginal cost meets marginal revenue, how to check the result, and why it does not mean zero profit.

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3 Government microeconomy intervention

What Happens With a Maximum or Minimum Price?

Learn when maximum and minimum prices cause shortages or surpluses, why the equilibrium price matters, and how buyers and sellers are affected.

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3 Government microeconomy intervention

What Does the Gini Coefficient Measure?

Learn what the Gini coefficient measures, how to interpret values from zero to one, and why income inequality is different from poverty or average income.

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