How to Structure a 15-Mark Economics Essay

The 15-mark essay is the most important question in IB Economics Paper 1. It tests your ability to explain, apply, and evaluate economic concepts at the highest level.

Scoring well requires a clear structure, strong diagrams, and genuine evaluation — not just description.

What a 15-mark essay requires

IB Economics 15-mark essays are split into two components:

• Knowledge and understanding (up to 5 marks): Definitions, accurate economic theory, diagrams
• Application and analysis (up to 5 marks): Real-world examples, diagram analysis
• Synthesis and evaluation (up to 5 marks): Balanced assessment, judgement, conclusion

The ideal essay structure

1. Introduction (2-3 sentences): Define key terms and state the argument you will make
2. Body paragraph 1: Explain the economic theory with a diagram
3. Body paragraph 2: Apply to a real-world example or context
4. Evaluation paragraph: Present counterarguments, limitations, or alternative perspectives
5. Conclusion: Make a reasoned judgement supported by your analysis

Practise structuring 15-mark essays and receive a detailed mark-by-mark breakdown with our Past Paper Feedback tool.

How to include evaluation

Strong evaluation includes:

• Identifying assumptions in the economic model
• Discussing short-run vs long-run effects
• Considering stakeholder perspectives (consumers, producers, government)
• Questioning the effectiveness of a policy or approach

Diagram integration

Diagrams should be embedded in your argument, not added as an afterthought. After drawing your diagram:

• Refer to it explicitly in your text
• Explain what the shift or change represents
• Identify the new equilibrium and its implications

Common mistakes

• No evaluation: Without evaluation, you cannot score above 10/15
• Unlabelled diagrams: Every axis, curve, and equilibrium must be labelled
• Generic conclusions: Your conclusion should directly address the question, not repeat your introduction

For more exam strategies, see our guides on IB Economics Evaluation Technique and How to Write a 10-Mark Economics Answer.