What happened
Brent crude, the international oil benchmark, has fallen below 71 dollars a barrel — a level last seen before the US and Israel conflict with Iran began. That is a fall of more than 38 percent from the post war peak of just over 126 dollars reached on 30 April. In market terms, this is not a dip. It is a full round trip.
The collapse began on 18 June, when the United States and Iran signed a memorandum of understanding to end hostilities and reopen the Strait of Hormuz. Brent fell 5 percent that day alone to close at 78.96 dollars, breaking below 80 dollars for the first time since March. The slide has continued through early July.
Two follow on developments deepened the move. The US Treasury authorised Iranian crude sales through August, effectively adding a large volume of previously sanctioned supply back into the global market. And tanker traffic through the Strait of Hormuz — the narrow shipping channel through which roughly a fifth of the worlds seaborne oil passes — picked up sharply, with vessels moving in both directions to load and deliver cargo.
The path down has not been smooth. On 26 June prices briefly resumed falling after an attack on a cargo ship near Oman, a reminder that the region remains volatile even with a framework agreement signed. But the overall direction has been relentlessly one way.
Why it matters
Oil is the single most important input price in the world economy. It shows up in the cost of moving goods by lorry, ship and plane; in the price of plastics, fertiliser and asphalt; in the electricity generated by gas fired power stations; and directly, most visibly, on the forecourt sign at your local petrol station.
When oil went from around 70 dollars to 126 dollars in the spring, that shock rippled outward. UK transport costs contributed the most to inflation in May, rising 6.8 percent year on year, up sharply from 4.5 percent in April, with airfares and motor fuel the main drivers. That is the oil spike showing up in official statistics with a lag.
Now the process runs in reverse. A sustained oil price at or below 71 dollars removes a large chunk of the inflationary pressure that central banks have spent the last quarter worrying about — including the pressure that prompted the ECB to raise rates in June and kept two Bank of England members voting for a hike.
For oil producing companies, of course, this is bad news. Shell and BP are among the largest constituents of the FTSE 100 by weight, and both earn substantially more when crude is expensive. A 38 percent fall in the oil price is a direct hit to their earnings outlook, and by extension to the index as a whole.
Explained simply
Oil markets price fear as if it were a real barrel. When the Strait of Hormuz looked like it might close, traders paid up for oil they might never need — buying an insurance policy priced in crude. The peace deal cancelled the policy, and the refund is arriving all at once.
Here is the mechanism. Oil is traded mostly through futures contracts — agreements to buy a barrel at a set price on a set future date. Anyone who needs oil in six months, from an airline to a chemicals plant, buys these contracts to lock in a price and protect themselves against a spike.
When war threatened the Strait of Hormuz, everyone who consumes oil suddenly wanted that protection at once, and speculators piled in alongside them expecting the price to climb. Demand for the contracts exploded. The price went up not because a single barrel had gone missing, but because the market was pricing the possibility that a great many barrels might go missing.
That possibility is what traders call the risk premium — the extra amount you pay above the price that supply and demand alone would justify, purely to protect yourself against a bad outcome. At the April peak, a large slice of that 126 dollar price was risk premium rather than physical scarcity.
Then the memorandum was signed, the Strait stayed open, tankers started moving, and the US even allowed Iranian oil back onto the market. The bad outcome did not happen. Everyone who had bought insurance no longer needed it, and rushed to sell those contracts at the same time. That is why the fall has been so fast: it is not new supply flooding in, it is fear draining out.
What it means for you
The most immediate effect is at the petrol pump. Crude oil accounts for roughly a third of the pump price in the UK — the rest is fuel duty, VAT and retailer margin — and forecourts pass changes on with a lag of about four to six weeks. A drop of this size should translate into something in the region of 8 to 10 pence a litre off petrol and diesel over the coming month or two. On a 55 litre tank, that is roughly 5 pounds per fill up.
Household energy bills follow more slowly, because gas is bought on long forward contracts and the Ofgem price cap is reset quarterly using an averaging window. If crude and gas stay at these levels, the effect would show up in the cap adjustment later in the year rather than immediately.
For investors, the picture is mixed. If you hold a FTSE 100 tracker, you own a meaningful slice of Shell and BP, and lower oil hurts them. If you hold a global fund, the drag is diluted. Airlines and transport stocks, by contrast, benefit directly: fuel is one of their biggest costs, and IAG and easyJet shareholders should see that in earnings.
The broadest benefit is the one you will not see on a statement. Lower oil means lower inflation, which means less pressure on the Bank of England to keep rates high. That, in turn, is what eventually feeds into cheaper fixed rate mortgages. Five year fixes currently sitting around 4.2 to 4.5 percent at major lenders have room to drift lower if this oil move sticks.
The bigger picture
Oil price spikes driven by geopolitics have a consistent historical pattern: they are violent, they are frightening, and they are usually shorter lived than they feel at the time. The 1990 Gulf War spike unwound within months. So did the 2011 Libya spike. Physical supply disruptions are almost always smaller than the market initially fears, because oil is fungible, tankers reroute, and producers with spare capacity step in.
What is different this time is the speed of the reversal — and the fact that sanctions relief has added genuinely new supply rather than merely removing a threat. That gives the downside more staying power than a pure sentiment unwind would.
Watch two things. First, whether OPEC responds. Producers do not enjoy 71 dollar oil, and a production cut is the obvious lever to pull. Second, whether the framework agreement holds. The attack near Oman in late June showed how fragile the calm is. If the deal frays, the risk premium can rebuild as quickly as it drained away.
