IB Economics HL Internal Assessment Exemplar: Microeconomics: Intervention

You included multiple relevant diagrams that were accurate, well labelled, and clearly tied to the article.

Your diagrams show welfare loss, policy shifts, and elasticity effects in a way that supports your argument.

You explained each diagram step by step and connected the visual changes to the real-world policy.

The tax diagram would be even stronger if you stated more explicitly the condition for full internalisation of the externality.

A brief comparison of the remaining welfare loss before and after intervention would make the diagrams even more persuasive.

You use microeconomic terminology accurately and consistently throughout the commentary.

Key terms such as externality, allocative inefficiency, deadweight loss, and price inelastic demand are applied in a way that strengthens your argument.

Your terminology matches the diagrams and the policy context, which makes the commentary easy to follow.

A few claims are less precise, especially where you describe junk food as an inferior good without enough support.

Some terminology could be used more carefully so that income effects and price responsiveness are not blended together.