If oil stays above $100: what follows
Brent crude averaged more than $100 a barrel in March, April, September and October 2026, as war around the Strait of Hormuz disrupted supply. Nobody knows how long that will last. What is known is how a lasting oil shock travels through an economy, and in what order. This page follows it step by step. It explains cause and effect; it does not predict the price of oil.
Oil is already high, and inflation has followed
From the oil field to your budget, in five steps
The longer oil stays high, the further down this chain the effects travel.
- WeeksFuel prices riseA barrel holds 42 US gallons (159 litres), so every $10 on a barrel adds about 24 US cents a gallon, or 6 cents a litre, to the cost of the crude in fuel, before taxes and margins.
- MonthsInflation rises, directly then indirectlyEnergy bills push up inflation at once. Then transport, plastics, fertiliser and food follow as firms pass on costs. ECB staff estimate that a 10% rise in energy prices adds about 0.2 percentage points to euro area inflation directly over three years, and 0.4 to 1.5 points more through these indirect effects, depending on how global the shock is.
- MonthsCentral banks decide whether to reactA one-off jump in fuel prices fades from inflation after a year. What central banks fear is "second-round effects": workers demanding higher pay and firms raising prices because they expect inflation to last. That fear is why the Bank of England, the Reserve Bank of Australia and Sweden's Riksbank raised rates in late October and early November.
- QuartersGrowth slowsMoney spent on fuel is not spent on anything else, and higher rates add to the squeeze. The ECB estimates that a 10% rise in the real price of oil from a supply shock lowers euro area growth by about 0.2 to 0.3 percentage points in each of the first three years.
- A year +Supply and demand respondHigh prices make new drilling profitable, and US shale producers can add supply within months. Consumers and firms use less. Over time this pulls prices down: the old saying is that the cure for high prices is high prices.
- Brent crude
- The main global benchmark price for oil, based on crude from the North Sea. It is quoted in US dollars per barrel. The US benchmark is called WTI (West Texas Intermediate).
- Supply shock
- A sudden change in the supply of something important, such as oil, that moves prices without any change in demand. A negative supply shock raises prices and slows growth at the same time, which leaves central banks with a dilemma.
- Imported inflation
- Inflation that comes from abroad: higher prices for imported goods and energy, or a weaker currency that makes every import more expensive.
- Risk premium
- The extra price or return investors demand because something might go wrong, such as a supply cut, a default or a war. It is not published; it shows up when prices move on news that changes no physical flow.
- Stagflation
- High inflation and weak growth or rising unemployment at the same time. It is hard to treat, because raising rates to fight inflation also weakens the economy further.
- Backwardation
- When oil for delivery soon costs more than oil for delivery later, so the futures curve slopes down. It signals a shortage now: buyers pay extra to get barrels today, and nobody wants to store oil. The opposite, when later delivery costs more (to cover storage), is called contango.
An oil shock moves money from importers to exporters
They pay more abroad for every barrel, which worsens their trade balance, weighs on their currencies and squeezes household incomes. Some governments cushion the blow with fuel subsidies or price caps, as Korea has, at a cost to their budgets.
Export revenue and government income rise, and their currencies tend to strengthen. The US is now a net exporter of petroleum, so the shock hurts its consumers but helps its producers, which softens the overall hit compared with the 1970s.
If central banks respond with rate rises, borrowers on variable rates and those refinancing pay more. See how a rate rise reaches your wallet.
Inflation erodes fixed payments, so investors demand higher yields, and existing bonds lose value. See why bond prices fall when yields rise.
Airlines, chemicals and transport firms face higher costs; oil producers and their suppliers earn more. Share prices tend to reflect that split.
What would change the path
- Progress in talks over Iran and the Strait of Hormuz, which would shrink the "risk premium" traders pay for fear of losing supply.
- Decisions by OPEC+ on how much oil its members pump.
- A slowdown deep enough to cut demand for oil.
- Releases of emergency oil stocks by governments.
What makes today different from the 1970s
Rich economies use far less oil for each unit of output than they did fifty years ago, central banks target inflation and act earlier, and the US produces more oil than any other country. All three make a repeat of 1970s inflation less likely, though not impossible: the key is whether expectations stay anchored. See what markets are pricing.
What happened in the 1970s
Oil quadrupled in 1973–74 and more than doubled again in 1979–80. Inflation reached double digits, growth stalled, and it took Paul Volcker's rate rises to break the cycle. The 1970s oil shocks and the Volcker squeeze tell the story, including what happened to shares, bonds and gold.
Where this is at work now
Recent stories, newest first.
Sources and notes
- Brent and inflation figures: the site's daily data feed (EIA via FRED for Brent; BLS, Eurostat and ONS for inflation). Monthly Brent averages above $100: March ($126.69), April ($124.24), September ($115.91) and October ($120.15) 2026.
- ECB estimates: Philip R. Lane, member of the ECB Executive Board, "Analytical perspectives on energy supply shocks", 13 May 2026. The inflation estimates are cumulative over three years from ECB staff simulations of a 10% rise in EU energy prices.
- Fuel arithmetic: our calculation (1 barrel = 42 US gallons = 159 litres).
- This is an explanation of cause and effect, not a forecast or investment advice.
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