Causes of Current Account Imbalances and Whether a Trade Imbalance Is a Cause for Concern

Answer

Part (a) — Causes of current account imbalances [10]

The current account records trade in goods and services, net income flows and net transfers; an imbalance is a net inflow (surplus) or net outflow (deficit) across these. The causes operate through relative prices, the exchange rate and cross-border income.

Relative inflation. Higher domestic inflation than abroad makes exports dearer and imports cheaper. With price-elastic export demand, export revenue falls more than proportionately while import expenditure rises — a balance-of-trade deficit. Lower relative inflation produces the reverse, a surplus.

Exchange-rate movements. An appreciation raises the foreign-currency price of exports and lowers the domestic-currency price of imports; provided the Marshall–Lerner condition holds, export revenue falls and import spending rises, worsening the current account. A depreciation improves it.

Cross-border investment income. A country that builds a stock of overseas assets — driven out by better foreign returns or higher foreign interest rates — earns future interest, profit and dividends. These property income inflows raise the current account towards surplus, even as the initial capital outflow is recorded in the financial account.

Part (b) — When is a trade imbalance a cause for concern? [15]

The starting point is that an imbalance is concerning only insofar as it threatens the other macroeconomic goals and ultimately the standard of living. Four factors govern the verdict, and the thesis is that an imbalance is concerning only when it is structural, persistent, and destabilising — a temporary or development-driven imbalance is not.

Root cause. A deficit caused by lost competitiveness, if left unaddressed, becomes chronic and drags down growth and employment — concerning. But a deficit caused by a temporary recession in trading partners self-corrects on their recovery, and a deficit caused by importing capital goods raises future productive capacity (a rightward LRAS shift) and future material living standards — not concerning, and especially benign for developing economies.

State of the economy. With balance of trade in equilibrium and the economy near full employment, a fall in net exports (X − M) lowers aggregate demand, and through the multiplier lowers national income, worsening demand-deficient unemployment.

Conversely, where the economy faces demand-pull inflation on the vertical range, the same fall in AD eases inflation — so a deficit is not a cause for concern. How much this matters depends on whether productive capacity is rising fast enough to absorb AD without inflation.

Nature and size of the economy. For a small open economy like Singapore — exports near 176% of GDP — a trade surplus is a vital engine of export-led growth, so a deficit is more concerning. For a large economy like the US, with a big domestic market, net exports are a smaller share of AD, so the growth-and-employment impact is muted. Size also governs spillovers: a large, persistent surplus (Germany, China) imposes deficits on partners, contracts their income, and invites protectionist retaliation — the route to the US–China trade war — whereas a small country’s imbalance is too minor to provoke retaliation.

Exchange-rate stability. A deficit exerts downward pressure on the currency. Under a managed float, defending the band drains foreign reserves; once exhausted, the currency depreciates sharply, raising imported-input costs and cost-push inflation, and may trigger a speculative attack — clearly concerning. But where the currency is a trusted reserve currency (the US dollar), foreigners willingly finance the deficit through capital inflows that offset the downward pressure, so stability holds and the deficit is not a cause for concern.

Judgement. No imbalance is intrinsically good or bad; concern is conditional. A trade imbalance warrants concern when it is structural (rooted in lost competitiveness), strikes an economy below full employment that relies heavily on trade, and threatens exchange-rate stability or provokes retaliation. It does not warrant concern when it is temporary, development-driven, occurring on the inflationary range, in a large domestically-driven economy, or financeable through a credible currency. Singapore’s case sits at the sensitive end — small, open and trade-reliant — so its policymakers should watch a deficit closely, while Germany’s and the US’s surpluses and deficits are concerning chiefly for their spillovers rather than for domestic damage.