When the news talks about oil prices, it almost always refers to Brent crude. Many people find this puzzling. Oil is produced in different countries, with different qualities and transport distances. In theory there should be many different prices. Yet in reality the world behaves as if there is almost a single global oil price.
The reason is simple. Oil markets are global.
Brent crude comes from oil fields in the North Sea between Britain and Norway. Originally it was simply one regional type of oil. Over time, however, it became the benchmark for global oil pricing as futures trading developed. Today many crude oil contracts around the world are priced relative to Brent, with small adjustments for quality or transport.
For example, higher quality crude might sell one or two dollars above the Brent price, while heavier crude might trade at a discount. Regardless of where the oil is produced, prices tend to move around the Brent benchmark. Brent futures trading creates a transparent price signal used by energy companies, airlines and commodity traders around the world.
One reason oil forms a global price is that transport costs are relatively low. A large oil tanker can carry around two million barrels of crude. Shipping oil across oceans typically costs only a few dollars per barrel. Compared with today’s oil price of roughly $100 per barrel, that cost is small.
Whenever price differences appear between regions, traders move quickly. If oil becomes cheaper in one market, traders buy it there and ship it to a higher-priced market. Demand rises in the cheaper region and prices increase. Supply rises in the expensive region and prices fall. This constant arbitrage prevents large price differences from lasting.
That is why even different types of crude oil tend to move together. West Texas Intermediate, for example, often trades close to Brent. Brent simply appears in the news more often because it is the most widely used benchmark.
Oil is usually sold at export terminals near where it is produced. Buyers may be refineries or large commodity trading houses. Once loaded onto tankers, the oil travels across the world. Sometimes a cargo is bought and resold several times while still at sea before its final destination is decided. This active trading network keeps the global market tightly connected.
This also explains why Americans still feel the impact of rising oil prices. The United States is now the world’s largest oil producer, pumping more than 13 million barrels per day. But global supply is around 100 million barrels per day. American oil can be exported, and domestic refineries must compete with global buyers. When international oil prices rise, petrol prices in the United States rise as well.
The same logic applies to Britain. Some argue that expanding North Sea drilling could reduce energy costs. Yet oil produced in the UK sector of the North Sea accounts for less than 1% of global supply. Even if new fields are developed, additional output would likely amount to only tens of thousands of barrels per day. Compared with a global market of roughly 100 million barrels daily, the effect on price would be negligible.
Others suggest a more direct approach: requiring all oil produced in British waters to be used domestically instead of exported. At first glance this might appear to lower local fuel prices. In practice the drawbacks would be significant. Oil companies currently sell at international prices. Forcing them to sell domestically at lower prices would reduce investment returns and weaken incentives to explore and develop new fields. Britain’s refining system is also integrated with global supply chains. Different refineries require different crude types, and the country still imports some oil and petroleum products. Restricting exports would disrupt these supply chains while sacrificing international revenue, yet prices would still be influenced by the global market.
In other words, oil markets are no longer national markets but truly global ones. Prices are determined by worldwide supply and demand rather than by any single country. Brent crude appears in the headlines precisely because it represents the closest thing the world has to a common oil price.
