Using the AD-AS Model in Your Macro IA: A Practical Guide

Author : Educifly Online Tutors | Published On : 13 Oct 2026

How Do You Use the AD-AS Model in an IB Economics IA?

To use the AD-AS model in your IB Economics IA, choose a news article about a macroeconomic issue such as inflation, unemployment, a recession or a government policy. Draw a clear, labelled AD-AS diagram that matches the article's events. Use precise terminology and explain step by step how a shift in aggregate demand (AD) or short-run aggregate supply (SRAS) changes price level and real output. Link every point to evidence from the article, then evaluate the policy or outcome using limitations such as time lags, spare capacity, and stakeholder impact.

That is the short version. This guide from Educifly walks through each step, so you can turn a news extract into a high-scoring commentary. If you are looking for reliable IB Economics IA Help, this is a good place to start.

Key Takeaways

The AD-AS model is one of the most useful tools for a macroeconomics commentary because most macro news can be explained as a shift in AD, SRAS or LRAS.
A strong IA diagram is accurate, fully labelled, and directly tied to the article.
Analysis means explaining a chain of cause and effect, not describing what the article already says.
Evaluation works best when it is specific to the article's country and context.
Avoid drawing the model just because you can. Every diagram must earn its place.

Why the AD-AS Model Is Ideal for a Macro IA

The IB Economics internal assessment asks you to write a portfolio of three commentaries, each based on a different published news article and each linked to a different part of the syllabus. For your macroeconomics commentary, the AD-AS model gives you a flexible framework that fits many real-world stories.

Here are examples of article topics that suit AD-AS analysis:

A central bank raising interest rates to control inflation
A government announcing a stimulus package or tax cut
Rising oil or energy prices affecting production costs
A country entering a recession after a fall in exports or consumer confidence
Investment in infrastructure, education or technology to boost long-term growth

In each case, the model lets you show how price level and real GDP change, which is exactly what examiners want to see applied to real evidence.

Step 1: Choose the Right Article

Your commentary is only as strong as your article. A good macro article for an AD-AS commentary should:

Be recent and published in a credible source
Focus on one clear macroeconomic issue or policy
Contain enough detail (figures, quotes, context) to apply theory
Allow for evaluation, meaning it includes a policy, trade-off or uncertain outcome

Avoid articles that only report statistics without explanation, and avoid articles that are too broad, such as a general overview of a whole economy. A narrower story is easier to analyse in depth within the word limit.

Step 2: Identify What Is Shifting

Before you draw anything, decide which curve moves and why. Use this quick reference:

What the article describes	Likely shift
Rising consumer spending or confidence	AD shifts right
Higher interest rates, higher taxes	AD shifts left
Rising wages, raw material or energy costs	SRAS shifts left
New technology or lower input costs	SRAS shifts right
Improved education, infrastructure or productivity	LRAS shifts right (long-term growth)

Remember the components of AD: consumption (C), investment (I), government spending (G) and net exports (X – M). When you explain a shift, name the specific component affected. For example, "higher interest rates reduce investment and consumption on credit, shifting AD to the left" is much stronger than "AD falls".

Step 3: Draw an Accurate AD-AS Diagram (Criterion A)

Diagram marks are among the easiest to secure and the easiest to lose. Follow these rules:

Label both axes: Price level (vertical) and Real GDP (horizontal)
Label every curve: AD, SRAS, LRAS (or AD1, AD2 for shifts)
Show the original and new equilibrium points, with their price levels and output levels marked on the axes
Use arrows to show the direction of each shift
Draw the diagram by hand or with clear software, and place it near the relevant analysis
Reference it in the text ("as shown in Figure 1")

Decide which approach to the long-run aggregate supply curve you will use. The Keynesian model includes a horizontal section when there is spare capacity, while the neoclassical (monetarist) model uses a vertical LRAS at full employment output. Pick the one that best fits the article, and be consistent. If the article describes an economy with high unemployment and unused resources, the Keynesian approach is usually the better match.

A common mistake is drawing a diagram that does not match the writing. If your text says AD increased, your diagram must show AD shifting right, not left.

Step 4: Use Precise Economic Terminology (Criterion B)

Examiners want to see terminology used accurately, not just frequently. For an AD-AS commentary, terms you might use include:

Aggregate demand, short-run aggregate supply, long-run aggregate supply
Demand-pull inflation, cost-push inflation
Deflationary (recessionary) gap, inflationary gap
Full employment output, potential output, spare capacity
Expansionary and contractionary fiscal and monetary policy
Multiplier effect, crowding out
Supply-side policies

Define a term only when it is essential to your argument. With only 800 words available, you cannot afford long textbook definitions. Instead, show your understanding by using the term correctly in context.

Step 5: Apply Theory to the Article (Criterion C)

Application means connecting the model to specific evidence. Quote or paraphrase figures, dates, policies and names from the article, and explain what each one means for AD or AS.

Weak: "Inflation is increasing, so aggregate demand has increased."

Strong: "The article reports that consumer spending rose 4% as wages grew, suggesting that consumption (C) has increased, shifting AD to the right and creating demand-pull inflationary pressure."

The second version uses evidence, names an AD component, and identifies the type of inflation. This is the standard to aim for in every paragraph. If you are unsure whether your application is strong enough, expert IB Economics IA Help can give you targeted feedback before you submit.

Step 6: Build Chains of Analysis (Criterion D)

The analysis criterion rewards logical, multi-step reasoning. Instead of stating a result, explain the process behind it. A reliable structure is:

Cause → Mechanism → Effect on AD/AS → Effect on price level and output → Wider consequence

For example, if a central bank raises interest rates:

Higher interest rates increase the cost of borrowing and the reward for saving.
Households reduce consumption on credit, and firms postpone investment.
C and I fall, so AD shifts left.
Equilibrium real GDP falls and the price level falls, reducing inflationary pressure.
Lower output may increase cyclical unemployment.

Notice that every step follows from the previous one. This is what examiners mean by developed analysis. Also consider linking to other concepts, such as the multiplier effect, which magnifies the final change in real GDP, or the role of exchange rates in changing net exports.

Step 7: Evaluate with Judgement (Criterion E)

Evaluation is where many students lose marks, because they list limitations without explaining how much they matter. Aim for balanced, article-specific evaluation. Useful angles for an AD-AS commentary include:

Time lags: Monetary and fiscal policies take time to work, so the effects may arrive when conditions have already changed.
Size of the output gap: A demand stimulus is more effective when there is spare capacity. Near full employment it may only create inflation.
Magnitude of the multiplier: If households save more or spend on imports, the multiplier effect is smaller.
Crowding out: Government borrowing may push up interest rates and reduce private investment.
Short run versus long run: Policies that help in the short run may not raise potential output.
Stakeholders: Consumers, firms, savers, borrowers, exporters and the government may be affected differently.
Assumptions and uncertainty: Business confidence, global conditions and exchange rates can change outcomes.

Finish with a justified judgement, for example: "Overall, the policy is likely to reduce inflation, but because the economy is already slowing, the risk of higher unemployment makes the policy less suitable in the short run." A clear, supported conclusion shows genuine evaluation rather than a simple list.

Worked Example: Structuring an 800-Word AD-AS Commentary

Imagine your article reports that a government has announced a major infrastructure spending programme during a period of weak growth. Here is how you could structure it:

Introduction (about 60 words): Identify the policy, the country and the macro objective, such as growth or lower unemployment.
Paragraph 1 (about 200 words): Short-run analysis. Increased government spending (G) shifts AD right, and the multiplier amplifies the effect. Include Diagram 1.
Paragraph 2 (about 200 words): Long-run analysis. Better infrastructure improves productivity and capacity, shifting LRAS right. Include Diagram 2 if it adds value.
Paragraph 3 (about 250 words): Evaluation. Discuss time lags, crowding out, government debt, spare capacity and who gains or loses.
Conclusion (about 90 words): A supported judgement on how effective the policy is likely to be.

This kind of planning keeps you within the limit and ensures each criterion is covered.

Common AD-AS Mistakes to Avoid in Your IA

Shifting the wrong curve. Interest rate changes affect AD, while input cost changes affect SRAS.
Missing labels. Unlabelled axes or curves can cost easy marks.
Describing instead of explaining. Restating the article is not analysis.
Generic evaluation. Phrases like "it depends" mean little without a reason.
Overloading the diagram. Show only the shifts you discuss.
Ignoring the article. The commentary should refer back to the extract throughout.
Exceeding the word limit. Remember each commentary has a maximum of 800 words, so every sentence must matter.

Frequently Asked Questions

Is the AD-AS model enough for a macro IA commentary?

Yes, it can be, provided it fits the article and you analyse it in depth. Some students add a second diagram, such as a Phillips curve or Keynesian multiplier illustration, but only if it genuinely strengthens the argument.

Should I use the Keynesian or neoclassical AD-AS model?

Choose the one that matches the economic situation in your article. If the economy has spare capacity, the Keynesian model is usually more suitable. If the focus is on long-run growth and full employment output, the neoclassical model is often clearer.

How many diagrams should I include?

Usually one or two. Quality matters more than quantity, and each diagram should be referenced and explained in your text.

Can I use the same article for different units?

The three commentaries in your portfolio must be based on different articles and different parts of the syllabus, so plan your choices early.

Where can I get IB Economics IA Help?

Your teacher is the first source of guidance, and you can also use structured support such as Educifly's expert tutoring, article selection advice, diagram checks and feedback on drafts.

How Educifly Supports Your IB Economics IA

At Educifly, we help IB students plan, write and refine their internal assessments with confidence. Our IB Economics IA Help covers article selection, criterion-by-criterion coaching, diagram review and evaluation techniques, so you know exactly what examiners are looking for. Whether you are just starting your macro commentary or polishing a final draft, expert guidance can make the difference between a good IA and an excellent one.

Final Thoughts

The AD-AS model is a powerful tool for your macro IA because it turns a news story into a clear, structured economic argument. Choose a focused article, identify exactly which curve shifts and why, draw a precise diagram, build developed chains of analysis, and finish with balanced evaluation tied to the context. Do this consistently, and your commentary will meet the demands of every assessment criterion.