External Stability

Syllabus: Economic Issues → External stability.

---

What external stability means

External stability is an economic objective: keeping Australia's external accounts and obligations at a level that does not threaten the sustainability of long-term growth, and that avoids a destabilising loss of international confidence.

It is a judgement about sustainability rather than a target number. No level of the current account deficit is officially correct, and that ambiguity is exactly what makes it good evaluation territory.

---

Measurement

Six indicators, and each needs its limitation understood alongside what it shows.

The current account deficit as a percentage of GDP. Expressing it as a share of GDP allows comparison over time and between economies, since $27 billion means something quite different for a $3 trillion economy than for a small one. The deficit was $27.1 billion in the March quarter 2026. Australia historically ran deficits averaging around 4% of GDP, moved into surplus from 2019, peaked at a record $20.5 billion surplus in the June quarter 2021 on surging commodity prices, and has since returned to deficit. The rough working rule economists apply is that a deficit sustained above 5 to 6% of GDP warrants concern, though it depends heavily on what the borrowing funds.

Net foreign debt as a percentage of GDP. What Australians owe foreigners minus what foreigners owe Australians, measured against GDP to show the servicing burden relative to the capacity to pay. It stood at $1,452.6 billion at 31 March 2026, roughly half of annual GDP.

Net foreign liabilities as a percentage of GDP. Net foreign debt plus net foreign equity, and the broader measure, since it captures foreign ownership of Australian assets as well as borrowing. Australia's international investment position was a net liability of $707.6 billion at March 2026.

That figure is much smaller than net foreign debt, and the reason is worth knowing: Australians hold substantial foreign equity, largely through superannuation funds investing overseas. Quoting debt alone overstates Australia's external exposure, and pointing that out is a strong evaluative move.

Terms of trade.

Terms of trade index = (export price index ÷ import price index) × 100

A rise means export prices are climbing faster than import prices, so a given volume of exports buys more imports, which improves the trade balance and raises national income. The index rose 1.1% in the March quarter 2026 to 96.4, well down from the record levels of the early 2020s.

The exchange rate, currently around US$0.70, which under a float is both an indicator and an automatic adjustment mechanism. A widening deficit tends to depreciate the currency, improving competitiveness and partially correcting the deficit without anyone acting.

International competitiveness, determined by relative costs, productivity and the exchange rate, and measured through unit labour costs and real exchange rate indices.

---

Trends

Australia ran persistent deficits for decades, averaging roughly 4% of GDP. From 2019 to around 2022 it ran surpluses instead, driven by the commodity price surge, which was a historic reversal. The goods and services surplus peaked at $41.3 billion in the June quarter 2022. As commodity prices normalised that eroded and the account returned to deficit. By the March quarter 2026 the deficit was $27.1 billion, with the goods and services balance in deficit for the first time since December 2017.

The composition is the whole story:

Component	March quarter 2026
Balance on goods and services	−$2.4 billion
Net primary income	−$23.7 billion
Net secondary income	−$1.0 billion
Current account	−$27.1 billion

Net primary income accounts for roughly 87% of the deficit.

---

Causes

The structural cause

Australia's investment opportunities have persistently exceeded domestic savings, and the shortfall is financed from overseas, producing a financial account surplus and a matching current account deficit.

Each year's borrowing adds to the stock of foreign liabilities, and servicing a larger stock produces a bigger net primary income deficit the following year. Naming that self-reinforcing loop is the strongest analytical move available in this topic.

It is also why the deficit is structural rather than a competitiveness problem. It is not caused by exporters who cannot sell. It reflects an economy with more investment opportunities than it has domestic savings to fund them.

Cyclical causes

Terms of trade movements come first, since falling commodity prices reduce export income directly. That is why the trade balance swung from a $41.3 billion surplus in 2022 to a deficit by 2026. The international business cycle matters too, because a downturn among trading partners cuts demand for Australian exports. So does the domestic cycle, since strong growth raises incomes and draws in imports. And exchange rate movements work through competitiveness and the J-curve.

The distinction to make explicitly, because it is what the 2025 Section III examiners were looking for: the goods and services balance is cyclical, swinging with commodity prices, while the net primary income deficit is structural and persists regardless of where the commodity cycle sits.

---

Effects

The negative case

Foreign liabilities accumulate, which raises the servicing burden and diverts future income offshore. Vulnerability increases to any loss of international confidence, which could sharply raise borrowing costs or force a disorderly depreciation. The exchange rate becomes more volatile, since the currency depends on foreigners continuing to want Australian assets.

Policy gets constrained, because governments may be reluctant to run expansionary policy that would widen the deficit further. Economists call that the balance of payments constraint on growth. There is a sovereignty argument where foreign ownership of key assets is high. And a higher risk premium on Australian borrowing raises interest rates for everyone, not just the borrowers who created the liability.

The counter-argument

This is where the marks are, because most students argue only one side.

Foreign capital funds investment that domestic savings cannot cover, and that investment builds productive capacity in mines, infrastructure and housing, which raises future output and the ability to service the obligation.

The Pitchford thesis goes further. Where a deficit results from private borrowing and lending between consenting, well-informed parties, it reflects rational choices about consumption over time rather than a policy failure, and governments should not target it at all.

Several features of Australia's position support that reading. The debt is predominantly private rather than government. Much of it is hedged or denominated in Australian dollars, so a depreciation does not automatically inflate the servicing burden. Net foreign liabilities are far smaller than net foreign debt, because superannuation funds hold large foreign equity positions. And the floating exchange rate acts as an automatic stabiliser, since a widening deficit depreciates the currency and improves competitiveness, which is a self-correcting mechanism fixed-rate economies simply do not have.

The balanced judgement

External stability is best understood as a question about what the borrowing funds and whether the obligations are manageable, rather than about the size of the headline number. A deficit financing productive investment, in an economy with a floating currency, hedged private debt and credible institutions, is far less concerning than the same figure in an economy borrowing in foreign currency to fund consumption.

That said, it is not costless. The net primary income drain is real, it is large, and it grows with the liability stock behind it.

---

A note on the syllabus change

External stability is a standalone economic issue in the 2009 syllabus, which is what you sit if your HSC is in 2026 or 2027.

The new Economics 11-12 Syllabus (2025), first examined in 2028, removes it as a standalone topic. If you come across study notes organised without it, they were written for a different cohort. See the syllabus change explained.

---

What the exam does with this

External stability is one of the most heavily examined areas in the course, carrying Section III in 2020, 2022 and 2025, and Section IV in 2018. It also turns up constantly as one of the three objectives in multi-objective questions, with 2018 Q25, 2019 Q25 and both 2021 Q25 and Q26 naming it.

Five things to get right.

Separate structural from cyclical causes. This is the highest-value move in the topic.

Quote the composition rather than the headline. "$27.1 billion, of which $23.7 billion is net primary income" is an argument. The headline on its own is just a fact.

Argue both sides, and bring the Pitchford thesis in explicitly. A response treating the deficit as self-evidently a crisis is not evaluating anything.

Use the floating exchange rate as the self-correcting mechanism. It is the main reason Australia's deficit is less dangerous than the raw number looks.

In multi-objective questions, give external stability real weight. Students write two pages on unemployment and one line here, which throws away a third of the marks.

Related notes: Australia's Balance of Payments · Exchange rates · Australia's trade and financial flows