Economics 101: Why Does the Strait of Hormuz Matter to the Global Economy?

A narrow waterway between Iran and Oman is once again affecting oil prices around the world.

Recent attacks on commercial vessels and falling ship traffic through the Strait of Hormuz have increased concerns about the security of global energy supplies. On October 14, Brent crude oil was trading at around $105 per barrel as markets continued to follow the risks in the region.

But why can events in one narrow strait affect fuel prices, inflation, interest rates, and economic growth in countries thousands of kilometres away?

Source: Gemini

The answer begins with the importance of oil in the global economy.

Why Is the Strait of Hormuz So Important?

The Strait of Hormuz connects the Persian Gulf with the Gulf of Oman and the Arabian Sea.

Major oil producers use this route to send oil and petroleum products to customers around the world. According to the U.S. Energy Information Administration, around 20 million barrels of oil passed through the strait every day in 2024. This was equal to about 20 percent of global petroleum liquids consumption.

This makes Hormuz one of the most important energy transit points in the world.

Economists often describe it as a chokepoint. A chokepoint is a narrow route through which a very large amount of trade must pass. If that route becomes unsafe or difficult to use, the effects can spread quickly.

Oil Does Not Need to Stop Completely

Oil prices do not rise only when physical supplies disappear.

Markets also react to expectations.

If traders believe that tankers may be attacked, shipping may slow down or future supplies may be interrupted, they begin to include this risk in the price of oil. This is called a risk premium.

Shipping companies may also ask for higher fees. Insurance costs can rise because transporting oil through the region becomes more dangerous. Some vessels may wait, change their routes, or require extra protection.

All these costs can increase the final price of oil, even if many tankers are still passing through the strait.

This is why a threat to supply can sometimes move prices before an actual shortage appears.

How Do Higher Oil Prices Reach Our Daily Lives?

Oil is not used only to produce petrol or diesel.

It is also connected to transportation, aviation, agriculture, manufacturing, plastics, chemicals, packaging, and many other industries.

Imagine that the price of diesel rises. A transport company must now spend more money to move food from a farm to a supermarket. The supermarket may then pay more for delivery, and part of this cost may be added to food prices.

A factory may also face higher energy, transportation, and material costs. An airline may pay more for fuel and increase ticket prices.

In this way, an increase in oil prices can travel through the economy step by step.

What Happens to Inflation and Interest Rates?

Higher energy and transportation costs can increase inflation.

This creates a difficult situation for central banks. They may want to lower interest rates to support businesses and economic growth. However, higher oil prices may keep inflation high and make rate cuts more difficult.

This is especially challenging because higher interest rates cannot produce more oil or make the Strait of Hormuz safer.

Central banks can try to reduce demand in the economy, but they cannot directly solve a supply problem.

A country may therefore experience both slower growth and higher inflation at the same time. Economists sometimes call this situation stagflation.

Why Are Oil Importing Countries More Vulnerable?

Countries that import most of their energy are usually affected more strongly.

When oil becomes more expensive, these countries must spend more foreign currency to buy the same amount of energy. Their import bills increase.

This can weaken the trade balance and create pressure on the local currency. If the currency also loses value against the dollar, imported oil becomes even more expensive in local currency.

The process may look like this:

Higher oil prices increase the energy import bill. A weaker local currency makes imports more expensive. Higher costs then contribute to inflation.

Households may feel the effects through fuel, electricity, food, transportation, and travel costs.

Do Oil Exporters Always Benefit?

Oil exporting countries may earn more income when prices rise.

However, the result is not completely positive.

Very high oil prices can weaken the global economy and reduce demand for energy. Exporters may also face shipping difficulties, higher insurance costs, or problems reaching their customers.

So, higher prices may bring more revenue in the short term, but long periods of instability can create risks for both importers and exporters.

A Small Strait With a Global Effect

The Strait of Hormuz shows us how connected the global economy is.

A security problem in one shipping route can increase oil prices. Higher oil prices can raise transportation and production costs. These costs can increase inflation, influence interest rate decisions, weaken currencies, and slow economic growth.

The most important point is that markets react not only to what has already happened, but also to what might happen next.

The next time oil prices rise after news from the Strait of Hormuz, remember that the market is pricing both the oil moving today and the risk that it may not move as easily tomorrow.

Discussion question: How do higher fuel and transportation costs affect daily life in your country?

Sources:

U.S. Energy Information Administration: The Strait of Hormuz

Reuters: Oil prices and shipping risks, October 14, 2026