The Strait of Hormuz: What It Means for Australia’s Cost of Living
Global events can feel distant from Australia, but when it comes to energy, shipping, and supply chains, what happens in the Strait of Hormuz does not stay there (EIA, 2023; IEA, 2023). This narrow, horseshoe-shaped waterway, which is not straight at all, carries a significant portion of the world’s oil and gas, and any disruption—real or perceived—quickly ripples through everyday Australian life.
This article breaks the situation into two realistic scenarios: what happens if the Strait remains open, and what happens if it closes again.
Part One: If the Strait Remains Open
Even if the Strait of Hormuz stays operational, that does not mean an immediate return to normal conditions. Disruptions do not resolve overnight, and Australia will continue to feel the after-effects for some time.
Lag in the Supply Chain
Oil and fuel markets operate with a delay. Even after tensions ease:
Shipping schedules need to stabilise
Insurance premiums (especially war-risk insurance) take time to reduce
Backlogs of delayed or rerouted vessels must clear
For Australia, which relies heavily on imported refined fuel, this lag can last several weeks to a few months (Department of Climate Change, Energy, the Environment and Water, 2023).
Fuel Prices and Cost of Living
Fuel prices tend to react quickly to risk—but fall more slowly once stability returns, a pattern observed in Australian fuel markets (ACCC, 2024; RBA, 2024). This means:
Petrol prices may remain elevated even after the Strait is clearly open
Transport costs stay high, feeding into groceries, goods, and services
Households continue to feel pressure at the checkout
This is often described as a “sticky” price effect—costs rise fast but come down gradually (RBA, 2024).
When Does It Normalise?
In a stable scenario where no further escalation occurs, you can expect:
Short-term (2–4 weeks): volatility continues, with fluctuating fuel prices
Medium-term (1–3 months): supply chains rebalance, shipping confidence improves
Longer-term (3+ months): pricing begins to reflect more typical conditions
However, any renewed tension can reset this timeline. The impacts are not abstract—they are already being felt across sectors. Petrol and diesel prices in Australia are already elevated due to ongoing geopolitical tensions, feeding directly into transport and food costs (ACCC, 2024; RBA, 2024). Australian agricultural groups have indicated rising harvest costs linked to fuel and logistics, which are expected to flow through to higher food prices. Similarly, the building industry, including peak bodies such as the Australian Industry Group, has warned that supply disruptions are constraining builders’ ability to meet demand. These pressures are compounding week by week, with each stage of disruption introducing new challenges for households and businesses.
Part Two: If the Strait Closes Again
A closure of the Strait of Hormuz would be a significantly more serious event, with immediate and visible global consequences (EIA, 2023; IEA, 2023).
Immediate Global Impact
If the Strait were fully or largely closed:
A large share of the global oil supply would be disrupted
Oil prices would likely spike sharply within hours or days (IEA, 2023)
Financial markets would react quickly and broadly
This would not be a subtle or uncertain event—it would be obvious and widely confirmed across markets and institutions (IEA, 2023; UNCTAD, 2023).
What It Means for Australia
Australia would feel the impact through several channels:
1. Fuel Supply Pressure
While Australia does not import most of its oil directly from the Gulf, global pricing sets local costs (Department of Climate Change, Energy, the Environment and Water, 2023; ACCC, 2024). A supply shock would:
Push petrol and diesel prices significantly higher
Increase costs for freight, aviation, and agriculture
2. Supply Chain Disruption
Higher fuel costs and shipping uncertainty would (UNCTAD, 2023):
Slow down imports
Increase costs of goods
Potentially lead to temporary shortages in some sectors
3. Cost of Living Surge
The flow-on effects would be broad (RBA, 2024):
Groceries and essentials become more expensive
Transport and logistics costs rise
Businesses pass on higher operating costs
How Long Would It Last?
That depends on how long the closure persists:
Short disruption (days to weeks): sharp but temporary price spikes
Extended closure (weeks to months): sustained inflationary pressure and deeper economic impact
The Government may need to respond with emergency measures such as activating level 3 or 4 of the National Fuel Security Plan.
Final Thoughts
Even distant geopolitical tensions can translate into very real, local consequences. That reality underscores the importance of staying informed, planning ahead, and not being caught off guard.
If the Strait remains open, recovery is likely to be gradual rather than immediate. If it closes, the impact would be swift, highly visible, and felt across the entire economy.
Understanding the difference between these scenarios helps cut through the noise of conflicting headlines and refocus attention on what truly matters: how global events ultimately shape everyday costs at home.
References
Australian Competition and Consumer Commission (ACCC). (2024). Petrol and diesel prices in Australia. https://www.accc.gov.au
Department of Climate Change, Energy, the Environment and Water. (2023). Australia’s fuel security and supply chains. Australian Government. https://www.dcceew.gov.au
International Energy Agency (IEA). (2023). Oil market report. https://www.iea.org
U.S. Energy Information Administration (EIA). (2023). World oil transit chokepoints. https://www.eia.gov
Reserve Bank of Australia (RBA). (2024). Inflation and the cost of living. https://www.rba.gov.au
United Nations Conference on Trade and Development (UNCTAD). (2023). Review of maritime transport. https://unctad.org
