Why the IB Economics internal assessment commentary is graded on three sentences, not twenty
IB Economics Paper 1 micro diagrams: which labels, which movements, and which three evaluation moves separate a 5 from a 7 on the IB Diploma Higher Level paper.
IB Economics rewards a particular kind of writing that most students are never explicitly taught. The marks on every paper — and on the internal assessment commentary — are not paid for the number of words produced, the number of diagrams drawn, or the number of theories cited. They are paid for the precision of a definition, the direction of an arrow, and the speed with which a candidate can switch from description to analysis to evaluation inside a single paragraph. For students sitting the IB Diploma Higher Level paper, the micro diagrams on Paper 1 are where this discipline first shows up under timed pressure, and where a 5 and a 7 are separated by a handful of marks that are easier to lose than to win.
The angle of this article is narrow on purpose. It is not a tour of the IB Economics syllabus and it is not a comparison of micro and macro as topic families. It treats one specific skill — the translation of a written micro scenario into a labelled diagram followed by a justified movement — and follows that skill from the IB Economics Paper 1 micro section, through the Paper 2 extended-response evaluation trap, into the Paper 3 data-response and the internal assessment commentary, where the same diagram-discipline reappears in disguise. The aim is to give a candidate reading this a concrete set of moves they can rehearse in the final weeks before the IB examination, mapped to the rubric descriptors that examiners actually apply.
What IB Economics examiners mean by a 'well-labelled' micro diagram
Most IB Economics candidates arrive at Paper 1 with a stock of diagrams memorised in roughly the right shape. The supply curve slopes up, the demand curve slopes down, the axes carry letters, and the equilibrium is marked with a cross. This is the floor, not the ceiling. The IB Economics mark scheme for Paper 1 Part (b) — the 8-mark analysis question on a micro diagram — does not award full marks for a correct shape and a correctly placed intersection. It awards marks for a diagram that communicates the shift, the new equilibrium, and the direction of change in both price and quantity, all without the candidate having to narrate the movement in prose.
In practice, three labelling habits separate a band 3 diagram from a band 5 diagram. The first is curve identification: every curve that has shifted should be relabelled with a subscript that distinguishes it from the original (S₁, S₂; D₁, D₂). The second is axis unit: candidates who write 'P' and 'Q' on their axes rather than price and quantity in words lose a mark on questions where the rubric specifically checks for the variable being identified. The third is annotation at the intersection: the original equilibrium and the new equilibrium should both carry letters (E₁ and E₂) and both carry coordinates, so that the marker does not have to read prose to know what changed.
The second habit, which catches most IB Economics HL candidates, is the failure to extend the diagram past the new equilibrium. A subsidy on production, for example, shifts supply down by the subsidy amount. Candidates who show only the new curve and the new intersection without marking the vertical distance between the two supply curves lose the mark that asks for the 'size of the shift' in the diagram. In my experience, the strongest 7-boundary responses draw a small bracket or a dashed vertical line between the two supply curves and label it with the word 'subsidy per unit' — a one-second piece of work on the page that converts a 5 into a 7 on the analysis mark.
From diagram to prose: how the IB Economics Paper 1 Part (c) evaluation mark is actually scored
Paper 1 Part (c) on a micro question is the 8-mark evaluation question, and it is the question that decides the difference between an IB Economics final grade of 5 and a final grade of 7 for most HL candidates. The rubric for this part does not reward extra length. It rewards a candidate who can, in roughly 250 words, identify one evaluative point, develop it with reference to the diagram or the scenario, and reach a justified conclusion. The mark scheme descriptors talk about 'an evaluative comment that is relevant to the context of the question', and they explicitly penalise candidates who substitute textbook evaluation phrases for context-specific reasoning.
For most candidates reading this, the easiest evaluative move on a micro question is a real-world assumption check. A perfectly competitive market diagram assumes many small buyers and sellers, perfect information, and homogeneous products. If the question is about a subsidy to a small number of large airlines, that assumption is doing real work in the answer, and a one-sentence flag of it scores the development mark. A second evaluative move, slightly harder to write, is a time-frame check: the short-run versus long-run impact of a tax, for instance, behaves differently when capital is fixed versus variable, and most IB Economics HL candidates are capable of writing that distinction in 40 words if they have rehearsed it once.
Common pitfalls in Part (c) include writing three evaluative points at surface level rather than one at depth (a band 3 trap), quoting a real-world example without linking it back to the diagram (a band 4 trap), and ending the answer with the word 'however' followed by a generic qualifier such as 'this depends on other factors' (a band 2 trap that the IB Economics examiner reads dozens of times per paper). The strong candidates write one evaluation point, develop it with a defined example, and end with a sentence that names which side of the argument they find more convincing and why.
Paper 2 extended-response: the IB Economics evaluation trap that costs a full band
Paper 2 of IB Economics is the extended-response paper, and it is the paper where the most capable candidates underperform. The reason is structural: the questions on Paper 2 are long, the parts are interconnected, and the evaluation marks are spread across the whole answer rather than concentrated in a single part. A candidate can produce a competent Part (a) diagram, a competent Part (b) analysis, and then lose the entire Part (c) evaluation mark by treating it as a final paragraph tacked on at the end. The IB Economics rubric for Paper 2 explicitly distributes evaluation marks across the response, and a final-paragraph approach is capped at a band 3 on the criterion that asks for 'a sustained evaluative argument'.
The tactical move is to plan the evaluation before writing. In the IB Economics examination, the strongest HL candidates spend the first 90 seconds of a Paper 2 question writing a short list in the margin: one real-world assumption they will challenge, one stakeholder whose position differs from the textbook conclusion, and one short-run versus long-run distinction they will draw. Those three points are then seeded into the response at natural moments — the assumption in Part (a) when the model is first introduced, the stakeholder in Part (b) when the analysis is at its most mechanical, and the time-frame in Part (c) when the conclusion is being built. This distribution is what the IB Economics mark scheme means by 'sustained evaluation'.
Common pitfalls and how to avoid them on Paper 2
- The textbook-evaluation trap. Writing 'this depends on government policy' as a standalone evaluation sentence. Replace it with a named policy, a stated direction of effect, and a one-line reason. 'A binding price ceiling on rental housing depends on whether the government enforces it; in cities where penalties for above-ceiling rents are high, the deadweight loss is smaller and the secondary effects on quality dominate' scores where the textbook version does not.
- The double-count trap. Repeating the same evaluative point in two different forms. Candidates who write 'in the short run firms cannot adjust' in Part (b) and then 'in the long run, supply is more elastic' in Part (c) without adding a new point have written one evaluation, not two. Add a stakeholder or an assumption the second time.
- The context-drop trap. Producing a generic evaluation that could apply to any question on the syllabus. The IB Economics examiner is required by the rubric to check that the evaluation is 'in the context of the question'. A sentence that does not mention the specific market, country, or policy in the stimulus will be read as generic and capped at the lower band.
Paper 3 data-response: mapping the 9-mark question before reading the extract
Paper 3 of IB Economics is the data-response paper at Higher Level, and it is built around two extended extracts that the candidate has not seen before. The structure is consistent across sittings: each extract carries an 8-mark short-answer question set, a 10-mark analysis question, and a 15-mark extended-response question. The mark that students most often under-prepare for is the 15-mark extended-response, which is where the IB Economics rubric is most demanding on evaluation and most tolerant of context-specific reasoning. A 7 on the 15-mark question requires an answer that is, in essence, a miniature Paper 2 response built on the data the examiner has supplied.
The first tactical move on Paper 3 is to read the question before reading the extract. This sounds counter-intuitive, but the IB Economics mark scheme rewards answers that engage with the question as written, not with every piece of data in the extract. Reading the question first allows the candidate to mark, in the margin of the extract, which numbers and which sentences are load-bearing for the question and which are decorative. For a 15-mark question on, say, the effectiveness of a central bank policy, only two or three data points in the extract are likely to matter; the rest is context. Candidates who read the extract first spend precious minutes trying to memorise statistics they will not need.
The second tactical move is to anchor the diagram to the data. Paper 3 questions at Higher Level almost always include a diagram opportunity, and the IB Economics rubric allocates 2 to 3 marks for a 'relevant diagram' that is correctly drawn and correctly labelled. The diagram does not need to be original; a standard AD–AS diagram, a Phillips curve, or a foreign exchange market diagram will score full marks if it is drawn with the candidate's own data points on the axes. The strongest candidates draw a small data table beside the diagram with two numbers from the extract, so the marker can see the link.
The internal assessment commentary: where the IB Economics grade is won on three sentences
The IB Economics internal assessment is a portfolio of three commentaries, each one written on a published article from a real news source. The portfolio is graded against five criteria: focus, terminology, application, analysis, and evaluation. The criterion that students most consistently under-perform on is evaluation, and the reason is that the IB Economics rubric asks for evaluation to be 'relevant to the article' and to be 'justified' — not just to be present. A commentary that ends with a single evaluative sentence such as 'this policy may have unintended consequences' scores a band 2 on evaluation, because it is generic and unjustified.
The tactical move on the internal assessment is to write the evaluation as three discrete sentences, each one tied to a different piece of reasoning in the body of the commentary. The first sentence should challenge an assumption made by the journalist or the economist quoted in the article. The second sentence should introduce a real-world limitation, naming a specific stakeholder, country, or market structure that the article does not address. The third sentence should reach a justified conclusion: in this article, the policy is more or less effective than the journalist suggests, because of X. A 7-boundary commentary has these three sentences embedded in the final third of the response, and an examiner reading the criterion can tick each one off against the rubric.
How IB Economics scoring translates preparation time into marks
IB Economics is graded on a 1–7 scale, and the boundary between a 5 and a 7 at Higher Level is roughly 65 to 75 marks out of 100 across the three papers and the internal assessment, with the internal assessment scaled to a percentage of the final grade. The implication for preparation is that a candidate does not need to improve everywhere; they need to improve in the two or three places where the rubric is most generous. Those places, in my experience, are: the Part (c) evaluation on Paper 1, the sustained-evaluation marks on Paper 2, and the 15-mark extended-response on Paper 3. The internal assessment is graded by the teacher and moderated externally, and the moderation is unforgiving on the evaluation criterion — a commentary that scores a band 3 on evaluation in the classroom is unlikely to be lifted to a band 5 by the moderator.
The following table maps common IB Economics question types to the rubric criterion that is most often lost, and the preparation move that recovers it.
| Question type | Paper | Most-often-lost criterion | Preparation move |
|---|---|---|---|
| Micro diagram (Part b) | Paper 1 | Shift identification and labelling | Re-draw 12 standard diagrams from a blank grid, with two equilibria and a labelled shift |
| Evaluation (Part c) | Paper 1 | Context-specific evaluative comment | Rehearse 6 assumption-checks in 40 words each, tied to a real-world market |
| Extended-response | Paper 2 | Sustained evaluation across the response | Plan 3 evaluation points in the margin before writing, and seed them across the answer |
| 15-mark data-response | Paper 3 | Data-anchored diagram | Read the question first, mark load-bearing data in the margin, and draw a diagram with extract numbers on the axes |
| Commentary conclusion | Internal Assessment | Justified evaluation | Write three discrete evaluative sentences, each tied to a different piece of body reasoning |
Building an IB Economics preparation plan around the rubric
A preparation plan for IB Economics should be built around the rubric, not around the textbook chapters. The reason is that the textbook covers material that may appear on the examination, but the rubric decides how the marks are paid. A candidate who has read every chapter and cannot write a context-specific evaluation in 250 words will underperform a candidate who has read two chapters and can write three such evaluations from memory. The plan should allocate roughly 60% of the available preparation time to writing and re-writing timed answers, and roughly 40% to reading, note-taking, and diagram rehearsal.
In the final four weeks before the IB Economics examination, the strongest preparation move is to complete one full Paper 1, one full Paper 2, and one full Paper 3 under timed conditions, marking each paper against the official rubric descriptors rather than against a mark scheme. Rubric-based marking forces the candidate to read the descriptors, and reading the descriptors is what produces the language that the examiner will reward. Candidates who mark their own work against a mark scheme tend to over-reward the answer that produces 'the right diagram' and under-reward the answer that produces the 'sustained evaluation' the rubric actually asks for.
The internal assessment should be drafted, peer-reviewed, and revised at least three times before submission. The first draft almost always scores a band 2 or band 3 on evaluation, and the third draft, with the three-sentence evaluation structure embedded, almost always scores a band 5 or band 6. The improvement is rarely about new content; it is about re-organising the existing content against the rubric descriptors. A candidate who reads the descriptors once and then drafts is gambling; a candidate who reads the descriptors, drafts, re-reads the descriptors, revises, re-reads the descriptors, and revises again is preparing.
Pulling the threads together: a single IB Economics skill across all four components
The skill that ties together the IB Economics Paper 1 micro diagram, the Paper 2 extended-response, the Paper 3 data-response, and the internal assessment commentary is the discipline of converting a context into a labelled model and then converting the model back into a justified judgement. The diagram is the model; the prose around the diagram is the context; the evaluation is the judgement. A candidate who has internalised this loop can apply it to a micro question about a subsidy on a Monday, a macro question about an interest rate decision on a Wednesday, and a 15-mark data-response about an exchange rate on a Friday. The content changes; the skill does not.
For most candidates, the limiting factor is not content knowledge — it is the speed and consistency with which the loop can be executed under timed pressure. The preparation moves described in this article — relabelling curves, naming axes, extending diagrams, planning evaluation in the margin, reading the question before the extract, writing three discrete evaluative sentences, marking against the rubric — are moves that can be rehearsed in 20-minute blocks, integrated into a normal revision timetable, and refined across the final weeks before the IB examination. They do not require a private tutor or a commercial course to be practised; they require a candidate who is willing to write, to read the descriptors, and to write again.
Conclusion and next steps
IB Economics is an examination that pays for precision. The candidates who score a 7 are not the candidates who write the most; they are the candidates who label their diagrams, who seed their evaluation across the response, who read the question before the extract, and who finish their internal assessment commentary with three justified evaluative sentences. Each of these is a rehearsable skill, and each can be lifted by 1 to 2 bands on the relevant criterion with focused preparation in the final weeks before the IB Diploma examination. The next step is to choose one of the skills — most candidates reading this will benefit most from the Paper 1 Part (c) evaluation move — and rehearse it on three past-paper questions this week, marking the answers against the rubric descriptors rather than against a mark scheme. IB Courses' one-to-one IB Economics HL programme analyses each student's Paper 1 Part (c) responses against the rubric descriptors and turns a 7 target into a concrete, week-by-week preparation plan anchored to the moves described above.