IB Economics HL Internal Assessment Example

The student included two relevant diagrams that are clearly tied to the proposed tax policy.

The student's diagrams use the main economic curves and quantities needed to show the market failure and policy response.

The tax diagram is not fully accurate because the tax wedge and the separate consumer and producer prices are not shown clearly.

The welfare-loss shading and the student's written explanation do not fully match, which makes the intervention harder to interpret.

The student uses a wide range of relevant economic vocabulary accurately, including terms linked to externalities, welfare, taxation, and equity.

The student's terminology is generally integrated into the commentary rather than appearing as isolated definitions.

A few terms are used imprecisely, especially where the analysis treats the tax as mainly reducing supply.

Some of the welfare and externality language would be stronger if the student distinguished more carefully between private and social benefit and between consumer and producer prices.