LONDON, 28 March 2026 – The global economy is beginning to feel a broad and synchronised impact from the ongoing Iran war, with business surveys and economic data pointing to slowing growth, rising costs and weakening sentiment across major regions.
Early indicators suggest the conflict is no longer a regional shock but a global macro event, affecting economies from the US and Europe to Asia through energy, trade and confidence channels.
Synchronized Slowdown Emerging Across Economies
Business surveys across major economies show a clear pattern of weakening activity. Purchasing managers’ indices (PMIs) in the US, eurozone, UK and Japan have all softened, reflecting slower private-sector growth and rising input costs.
- Eurozone activity has slipped to a 10-month low
- The UK recorded its weakest expansion in six months
- Japan’s business activity fell to a three-month low
- India saw its slowest private-sector growth in three years
This broad-based slowdown highlights what economists describe as a “synchronised shock”—a rare situation where multiple major economies weaken at the same time.
Energy Shock Driving Inflation Pressures
At the centre of the disruption is a sharp rise in energy prices, driven by supply constraints linked to the Strait of Hormuz, one of the world’s most critical oil transit routes.
Oil prices have surged significantly since the conflict began, pushing up production costs globally and fuelling inflation concerns.
Higher energy costs are now:
- Increasing input prices for manufacturers and services
- Raising transport and logistics costs
- Feeding into consumer inflation globally
This has forced central banks to reassess policy paths, with expectations shifting toward prolonged higher interest rates.
Growth Outlook Downgraded Globally
Global institutions are already revising economic forecasts downward. The OECD now expects global growth to slow to around 2.9% in 2026, compared with earlier expectations of stronger expansion.
At the same time, inflation forecasts have been revised higher, with G20 inflation projected to rise to about 4.0%, reflecting the impact of energy and supply disruptions.
A prolonged conflict could further:
- Cut global growth by up to 0.5 percentage points
- Push inflation higher by nearly 1 percentage point
Consumer and Business Confidence Weakening
Beyond hard economic data, sentiment indicators are also deteriorating.
Consumer confidence has dropped sharply, particularly in the United States, as higher fuel prices and market volatility weigh on household expectations.
Businesses are also becoming more cautious:
- Hiring has slowed
- Investment decisions are being delayed
- Cost pressures are forcing firms to cut overheads
This combination raises concerns about a feedback loop, where weaker confidence leads to reduced spending and further economic slowdown.
Dual Shock: Growth Weakens While Prices Rise
Economists increasingly describe the current environment as a dual shock, where growth slows while inflation rises simultaneously.
This dynamic raises the risk of stagflation, a challenging scenario for policymakers, as efforts to control inflation could further dampen economic activity.
Energy-dependent regions such as Europe and parts of Asia are particularly vulnerable, while global trade disruptions are amplifying the impact.
Implications for Asian Investors
For investors across Asia, the global spillover effects are becoming more pronounced:
- Export-driven economies may face weaker external demand
- Energy-importing countries could see rising inflation and currency pressure
- Market volatility is likely to remain elevated amid geopolitical uncertainty
At the same time, sectors linked to energy and commodities may benefit from higher prices.
Outlook: Broad and Prolonged Impact
The latest surveys suggest that the economic toll of the Iran war is broad, deep and likely to persist if disruptions continue.
While not yet triggering a global recession, the conflict is already reshaping the macro landscape, slowing growth, lifting inflation and increasing uncertainty across markets.
For now, the world economy is entering a more fragile phase, where geopolitics, not just fundamentals, will dictate the pace of growth.
