An announcement is not an outcome
A central bank cuts its policy interest rate partly to influence broader monetary and credit conditions. That could encourage spending and investment, shifting aggregate demand. Whether this changes real output, employment or inflation depends on the economy's capacity, banks' lending behavior, confidence and time lags. A commentary must not describe a forecast as already measured.
The current Economics IA involves three commentaries based on different syllabus units and current news, with a strict 800-word limit per commentary and distinct key concepts. Use one eligible article and one appropriate concept to analyze a real issue. The example here is invented, so it is not a qualifying IA article.
A four-stage source-to-claim audit
Imagine a hypothetical policy-rate change from 5.0% to 4.5%. The percentages are teaching values, not a real country's announcement. Read horizontally to identify what each stage would require before you made a factual claim.
| Stage | Possible mechanism | Evidence to seek | Not justified yet |
|---|---|---|---|
| Announcement | A policy-rate reduction is announced | Actual decision date and rate | Retail borrowing rates changed by the same amount |
| Bank transmission | Some loan or deposit prices may adjust | Published commercial rates and credit terms | All households immediately borrow more |
| Spending response | Investment and consumption may grow | Subsequent credit and spending indicators | Demand growth was caused only by the rate |
| Macroeconomic effect | Aggregate demand may shift | Output, prices, employment and supply data | Observed inflation followed the model exactly |
What an AD–AS diagram can show
An expansionary demand-side interpretation starts from a shift in aggregate demand, conditional on monetary transmission. Label both equilibria and discuss spare capacity: a relatively flat short-run supply curve allows a larger output response, while capacity constraints can make price effects more prominent. Without a documented spending response the rightward shift is a modelled possibility, not an observed economic event.
Do not force unrelated supply shocks into the same story. A later price increase could reflect a change in production costs or import prices instead. An evaluation should consider which mechanism your article can and cannot substantiate.
Whose outcome matters?
Borrowers
Rate changes may reach variable-rate debt before fixed-rate loans, changing household cash flow unevenly.
Firms
Cheaper finance is not sufficient for expansion if firms expect weak future sales or credit is unavailable.
Central bank
An action can support output but risk unwanted price pressure if supply cannot respond.
Illustrative conclusion: The rate cut could support investment if banks transmit the lower rate and firms expect demand, but the size and timing of the benefit cannot be assumed from the decision itself. This is a defensible conditional inference, not a claim about observed data.
Use a real news article before submitting
- Identify the article's date, publisher, author, unit, key concept and factual policy details.
- Separate the observed change from expert predictions and your own modelled implications.
- Explain the diagram's assumptions and evaluate at least one competing outcome.
- Check your real source and distinct portfolio units using the existing Economics IA news portfolio guide.
Sources & verification
Primary-source references used to verify key assessment facts on this page. Last source check: October 14, 2026.
The interest rate, timeline and conditional conclusions are a fictional teaching example, not actual policy data, an assessment mark or a student exemplar.
- IB Economics course overviewOfficial subject overview for the current Diploma Programme Economics course.
- IB Diploma Programme assessment and examsOfficial statement of coursework and assessment context.