What the Strait of Hormuz Means for New Zealand

Dr Eilya Torshizian, Leonard Hong

The recent escalation of tensions involving Iran and the potential disruption to the Strait of Hormuz represent more than a geopolitical event. They constitute an economic shock with global reach. A significant share of global energy and trade flows through this corridor. Even the risk of disruption has immediate implications for shipping costs, insurance premiums, and commodity prices. For a small, trade-dependent economy such as New Zealand, these developments matter not because of proximity, but because of exposure.

War affects economies not only through realised disruptions but through expectations. News about conflict shapes beliefs about future inflation, taxation, and economic stability. Firms may adjust pricing in anticipation of higher input costs. Financial markets reprice risk. Households reassess spending decisions. These expectation-driven adjustments can occur well before any measurable change in trade volumes or fiscal policy.

A key question is whether households in New Zealand respond to such geopolitical news. Distance from conflict and historical experience may dampen behavioural responses. New Zealand households have often treated overseas conflicts as largely external events. Combined with relatively low national savings, this raises the possibility that households do not significantly adjust consumption in response to war-related expectations.

Preliminary empirical analysis supports a cautious version of this view. Estimates of the impact of defence-related news on economic activity do not show a stable or robust effect on household consumption. The results vary across sample periods and are sensitive to specification, suggesting that the consumption channel is, at best, weak. This contrasts with some international evidence where expectations of future government spending can influence labour supply and demand.

If households do not materially adjust spending in response to war news, the main transmission mechanisms must lie elsewhere. For New Zealand, the most important channels are external: trade flows, input costs, and financial conditions. This shifts the focus away from domestic demand toward supply-side and cost-based effects.

New Zealand’s export base, particularly in agriculture, has meaningful exposure to global shipping routes that may be affected by instability in the Middle East. Disruptions to key maritime corridors can increase freight costs, delay shipments, and reduce export margins. Even if trade volumes remain stable, the cost of getting goods to market may rise materially.

Geopolitical tensions also influence global commodity markets. Energy prices tend to rise during conflict, feeding into transport and production costs. At the same time, disruptions to global logistics and labour mobility can increase wage and input pressures in certain sectors. These effects are likely to be uneven across industries but collectively point to rising cost pressures.

These dynamics create the risk of inflation without strong domestic demand. Imported cost increases—via fuel, shipping, and intermediate goods—can push up the Consumers Price Index even if household consumption remains stable - see our report on the impact of oil prices on cost indices here. If firms pass these costs through to prices and workers respond with higher wage demands, inflation expectations may become embedded. This presents a policy challenge: inflationary pressure emerging from external sources rather than domestic overheating.

Torshizian (2019), Business Confidence, News, and Economic Growth, shows that business confidence is strongly influenced by news and can help predict short-term economic activity. However, it also shows that such indicators do not reliably identify turning points in the economic cycle. In the context of geopolitical shocks, this limitation becomes more important. If households do not significantly adjust consumption, and if the shock operates through external cost channels, business confidence may understate the true economic risks.

These developments raise several questions for policymakers. How can trade policy reduce exposure to vulnerable shipping routes? Should New Zealand diversify export markets or logistics networks? How should monetary policy respond if inflation rises while growth remains weak? And what scenarios, from short-lived disruption to prolonged conflict, should fiscal authorities prepare for? War news may appear distant, but its economic consequences are not.