IB Economics SLTopic 4 — The Global EconomyPaper 1 & 2Core idea~9 min read
How the Accounts Fit Together
The balance of payments is called a balance for a reason. If a country spends more abroad than it earns abroad, the difference has to come from somewhere, and the only places it can come from are selling assets or borrowing. That single idea turns a table of numbers into an argument about a country’s future.
📘 What you need to know
The current account and the capital and financial account must offset each other, so that the balance of payments as a whole comes to zero.
In practice the figures never match exactly, and the gap is recorded as net errors and omissions.
A current account deficit must be matched by a surplus in the capital and financial account.
That surplus is money coming in to buy assets or lend: the deficit is being financed.
A current account surplus means the opposite: the country is buying foreign assets with what it earns.
A deficit is not automatically bad. What matters is its size, what the money bought, and how it is being financed.
Under a floating rate, a large deficit tends to weaken the currency, which starts to correct it. Under a fixed rate, that does not happen automatically.
A persistent deficit means rising foreign ownership and rising income payments abroad in future years.
Why the two sides must match
Think about a single household for a moment. If you spend more than you earn in a year, you either sold something you owned or you borrowed. A country is the same. The current account measures what it earns and spends; the financial account records the assets it sold and the loans it took to cover the difference.
This is an accounting identity, not a prediction. The accounts balance by construction; the economics is in what each side is made of.
WORKED EXAMPLE
A country records a current account balance of −$27bn and net errors and omissions of +$2bn. Calculate the balance on the capital and financial account. [2]
Step 1: write the identitycurrent account + capital and financial account + errors = 0Step 2: substitute−27 + X + 2 = 0Step 3: solveX = 27 − 2 = +$25bnA surplus of $25bnSense check: a current account deficit needs money flowing in to finance it, so the answer had to be positive.
How a deficit gets financed, and why it matters
All three routes below balance the accounts perfectly. They leave the country in very different positions, and this is where the evaluation marks live.
A deficit that pays for imported machinery and is financed by direct investment can be a sign of an economy growing. One that pays for consumption and is financed by short-term borrowing is a warning.
Is a deficit a problem?
The honest answer is that it depends, and here are the four things it depends on. Use them as your evaluation structure in any question on this.
Question to ask
Less worrying
More worrying
How large is it?
A small share of GDP
Large and growing as a share of GDP
What did the money buy?
Machinery and capital goods
Consumer goods
How is it financed?
Long-term direct investment
Short-term borrowing and hot money
How long has it lasted?
A year or two in a downturn
Persistent across the whole cycle
What happens if it persists
Each year of deficit adds to what foreigners own in the country, and every one of those assets pays income back out later. That shows up as a worsening primary income line, which makes the current account harder to fix in future. Meanwhile, if the money financing the deficit is short-term, it can leave quickly, and a sudden stop forces a sharp fall in the currency, higher interest rates, or both.
And a persistent surplus?
Surpluses look comfortable but are not free of problems either. Growth built on selling to other countries depends on their demand holding up. A persistent surplus also puts upward pressure on the currency, which eventually eats into the competitiveness that created it, and it can mean domestic consumption is being held below what the country could actually afford.
The link back to exchange rates. Under a floating system, a large deficit means the country is supplying its currency to buy imports, which pushes the rate down, which makes exports cheaper and starts to close the gap. Under a fixed rate, that safety valve is shut, so the adjustment has to come from reserves or from the domestic economy instead.
WORKED EXAMPLE
Plan: “Evaluate the consequences of a persistent current account deficit for an economy.” [15]
1 Set-up
Define the current account and a deficit. State the identity: the deficit must be financed by a surplus in the capital and financial account.
2 Analysis
Explain the financing: assets sold to foreign owners, or borrowing. Each year adds to foreign ownership, and to future outflows of profit and interest.
3 The case that it is a problem
Rising foreign liabilities; a worsening primary income balance; vulnerability if short-term money leaves; downward pressure on the currency and therefore imported inflation.
4 The case that it may not be
A deficit can reflect imported capital goods that raise future output; it can reflect strong domestic growth; financed by direct investment it is far more stable; under a floating rate it partly corrects itself.
5 Judgement with a reason
“The size of the deficit matters less than its composition. Financed by long-term investment and spent on capital goods, a deficit of this size is sustainable. Financed by short-term borrowing and spent on consumption, the same number is a warning, because the money can leave faster than the economy can adjust.”
Judge the composition, not the numberIf the question gives you data, quote the deficit as a share of GDP and say which of the four tests the country passes.
Trade, currencies and the balance of payments are three views of one thing: money crossing borders. A diagram for one will often help you answer a question about another.
💡 Exam tip
Quote the identity in any question about the accounts fitting together. It is one line and it frames the whole answer.
Never say a deficit is bad without conditions. The four tests above give you a ready-made structure.
Name the financing. Direct investment, portfolio flows and borrowing are three different situations.
Link to future income. Assets sold today mean income leaving the country tomorrow, which appears in primary income.
Bring in the exchange rate as the automatic correction under a float, and explain why a peg blocks it.
Give surpluses their share of criticism too, if the question allows it. Very few students do.
⚠️ Common mix-up
Saying the balance of payments is in deficit. The whole thing balances; it is the current account that can be in deficit.
Treating a financial account surplus as good news in itself. It is the mirror image of the current account deficit.
Forgetting errors and omissions when a calculation does not quite add up.
Assuming a deficit must be closed immediately. Sustainability depends on how it is financed.
Ignoring what the imports were. Machinery and consumer goods have very different consequences.
Thinking a surplus means an economy is well managed. It may mean domestic demand is weak.
Up next: Sustainable Development and the SDGs — the last part of this topic, where the question stops being how much a country produces and becomes how well its people live.
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