War News and Economic Expectations: What Global Conflict Means for New Zealand

Dr Eilya Torshizian

War News and Economic Expectations: What Global Conflict Means for New Zealand

The recent escalation of hostilities between the United States, Israel, and Iran has rapidly expanded into a regional conflict involving missile strikes, naval attacks, and disruptions to shipping routes in the Middle East. Such events affect global markets almost immediately. Oil prices, shipping insurance, and financial markets respond quickly. Yet even before these channels operate, the news of conflict itself can influence economic behaviour by changing expectations about government spending, taxation, and future economic conditions.

War news can affect the economy even before any physical mobilisation occurs. Announcements of defence buildups alter expectations about future government spending, taxation, and macroeconomic conditions. Households may adjust consumption in anticipation of higher future taxes or inflation, while firms may delay investment if they expect tighter fiscal conditions or external disruption. More broadly, geopolitical uncertainty tends to weaken consumer and business confidence, which can reduce spending and investment even without immediate economic damage.

Fiscal theory offers two competing mechanisms. A demand-based view predicts that higher government spending raises output through multiplier effects. A neoclassical view predicts that higher public spending crowds out private activity and that higher marginal tax rates reduce labour supply and investment through substitution effects. The empirical question is which mechanism dominates.

Evidence from the United States, most prominently Barro and Redlick (2011), suggests that defence spending multipliers are positive but below one. Temporary defence increases raise GDP modestly, while private investment declines. More importantly, increases in marginal tax rates have sizable negative effects on output, implying that tax-financed spending can reduce GDP overall. Financing structure matters as much as spending itself.

Applying a similar empirical framework to New Zealand yields a more complex picture. The contemporaneous defence-spending coefficient varies sharply across samples beginning in 1939, 1946, 1950, and 1954. In some specifications, the multiplier is near unity; in others, it is negative or implausibly large. This instability indicates that the estimated effect of defense spending is sensitive to sample choice and structural breaks.

The forward-looking “defence news” variable behaves differently from the U.S. case. In at least one post-1950 specification, anticipated future defence spending is associated with lower GDP. This contrasts with U.S. evidence, where anticipated buildups raise output through labour-supply responses. In a small open economy, anticipated military commitments may coincide with import compression, exchange constraints, or fiscal tightening, offsetting any demand stimulus.

Tax effects are also weaker in the New Zealand estimates. Changes in average marginal tax rates appear statistically insignificant across specifications. This diverges from U.S. findings of large negative tax multipliers. The difference may reflect limited variation in marginal rates, measurement differences, or the statistical limitations of smaller historical samples.

These differences are economically coherent. New Zealand is a small open economy with historically strong trade dependence and external constraints. Wartime or geopolitical shocks may operate through trade volumes, capital flows, and import availability as much as through domestic fiscal channels. Under such conditions, defence spending does not translate cleanly into net domestic demand.

The broader implication is that war news can affect consumption, investment, and taxation expectations, but the macroeconomic transmission depends on economic structure. In large closed economies, demand effects may dominate. In small open economies, external constraints and financing conditions can attenuate or even reverse those effects. Fiscal responses to geopolitical shocks must therefore account for openness, financing method, and the credibility of future tax adjustments.