IB Economics HLTopic 4 — The Global EconomyPaper 1, 2 & 3Core skill~11 min read
Progress Towards the Sustainable Development Goals
The goals come with data attached, and that data turns up in Paper 2 and Paper 3 as charts and tables. This page is about reading them properly: what the colours mean, why the trend matters more than the level, and the percentage trap that catches most candidates.
📚 What you need to know
Each SDG has indicators that track progress, reported country by country.
Dashboards show a status (how far from the target) and a trend (which way it is moving).
Progress is rarely smooth: many indicators improve sharply and then reverse.
Common indicators include the prevalence of undernourishment, adults with a bank or mobile money account, and intentional homicides per 100,000 people.
The data usually lags by several years, so the current position may be better or worse.
Percentage points and percentages are different things, and mixing them up loses marks.
How to read an SDG dashboard
That last line is the whole skill. A poor country moving quickly is a better development story than a middling country standing still, and saying so is worth a mark.
What real progress looks like
Progress on the SDGs is almost never a smooth line. A common pattern is a period of dramatic improvement, followed by a stall or a reversal — often when a shock hits, or when the easy gains have been taken and the remaining ones cost far more per unit of progress.
Notice the indicator is lower at the end than at the start, so “progress” is technically correct — and completely misleading if you stop there.
🧩 How to describe a chart in four moves
Overall direction. Compare the first and last values and give the change.
The turning points. Name where the trend changed and quantify the sharpest movement.
The recent trend. Say what the last few years are doing, because that is what policy has to respond to.
The caveat. Note the data lag, so the current position may already differ.
Three indicators worth knowing
Indicator
What it measures
Why it matters economically
Prevalence of undernourishment Goal 2
The share of the population whose food intake is insufficient to meet dietary energy requirements for a minimum of one year
Undernourishment lowers productivity directly, so it feeds straight into the development loop of the poverty trap
Adults with an account Goal 8
The share of adults aged 15 and over with an account at a bank or other financial institution, or who have used a mobile money service in the past twelve months
Access to banking allows transactions that raise living standards — a remote farmer can be paid by mobile phone rather than waiting for cash
Intentional homicides per 100,000 Goal 16
Unlawful killings resulting from domestic disputes and interpersonal violence, excluding deaths in armed conflict
A usable proxy for the strength of institutions and the rule of law, both of which determine whether investment and reform deliver anything
The banking indicator is the one I would reach for in an essay. It connects directly to institutional change, microfinance and the poverty trap, and the mobile money component explains how countries with almost no bank branches leapt straight to widespread financial access.
Percentage points are not percentages
This catches more candidates than any other calculation in the unit. If the share of adults with an account rises from 20% to 50%, that is a rise of 30 percentage points and a rise of 150 per cent. Both statements are true and they describe the same change. Using the wrong one, or writing “a 30% rise”, is wrong.
The two ways to describe a change in a percentage
Percentage point change = new value − old value
Percentage change = ((new − old) ÷ old) × 100 the first is a subtraction, the second is always relative to the starting value
The base matters. A fall of 60% followed by a rise of 60% does not return you to where you started, because the second calculation uses a much smaller base. That is why a chart can show a big fall, a big rise, and still end up below the original level.
Worked examples
WORKED EXAMPLE 1
An undernourishment indicator falls from 22 to 8, then rises to 13. Calculate both percentage changes and comment on the overall progress. [4]
Step 1: the fall(8 − 22) ÷ 22 × 100 = −63.6%Step 2: the rise(13 − 8) ÷ 8 × 100 = +62.5%Step 3: the trap to avoid
A 63.6% fall followed by a 62.5% rise does not cancel out, because the second change is measured from a much smaller base. The indicator ends at 13, not back at 22.
Step 4: the comment
Overall the indicator improved, from 22 to 13, a fall of 40.9%. But the recent direction is the wrong one and the trend arrow would be decreasing.
−63.6%, then +62.5%; overall −40.9% but currently worsening
WORKED EXAMPLE 2
The share of adults with a bank or mobile money account rises from 20% to 50%. Express this change in two ways and explain the development significance. [4]
Step 1: percentage points50 − 20 = 30 percentage pointsStep 2: percentage change(50 − 20) ÷ 20 × 100 = 150%Step 3: what it means
The number of adults with financial access has risen two and a half times. Households can now save, receive payments remotely and borrow against a record.
Step 4: link to theory
This is the institutional change that lets savings become investment, so the growth loop of the poverty trap can begin turning.
Step 5: the caveat
Half the adult population still has no account, and the figure describes a year that has already passed.
A rise of 30 percentage points, or 150 per centnever write “a 30% rise” here — it is the single most common error in this topic
💡 Exam tip
Give status and trend separately when describing an indicator. They are different pieces of information.
Quantify. “It fell sharply” earns less than “it fell 63.6% between those years”.
Always mention the most recent direction, not just the overall change.
Use percentage points when comparing two percentages, and say so explicitly.
Add the data lag caveat once. It is a real limitation and shows you understand the source.
⚠ Common mix-up
A percentage point change is not a percentage change. Say which one you mean.
A falling indicator is not always bad. For undernourishment and homicides, down is progress.
Overall improvement does not mean current improvement. Check the last few years separately.
Percentage falls and rises do not cancel. The base changes each time.
Do not treat SDG data as precise. Much of it is estimated and several years old.
That completes Topic 4. You now have the whole arc: what sustainable development means, how to measure it, what blocks it, and every family of policy used to push it forward. If you want one thing to revise first, make it the poverty trap diagram — almost every question in this unit can be answered through it.
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