The Strait of Hormuz, the world’s most critical oil chokepoint, remains firmly in the crosshairs of geopolitical risk. Iran’s latest warning that reopening the strait will follow a ceasefire is not so much an olive branch as it is a loaded threat dressed in diplomatic garb. For markets, this is déjà vu with a vengeance: the same playbook that sent oil prices spiralling in 2019 is being dusted off, except this time the stakes are higher and the margin for error is thinner.
Let’s cut through the noise. The Islamic Republic is essentially saying, “We control the tap, and you will drink only when we say so.” This is not a negotiation; it is a ransom note. The timing is particularly savage for a global economy still nursing a hangover from supply chain disruptions and inflationary shocks. Brent crude, which had been flirting with $80 a barrel, is now eyeing the $90 mark, and the trajectory is anything but southward.
The market’s reaction has been predictably jittery. Options premiums for oil contracts are spiking as traders hedge against a worst-case scenario: a prolonged closure of Hormuz, through which about 20% of the world’s oil passes. The last time this happened, in 2019 after attacks on Saudi Aramco facilities, prices jumped 15% in a single day. This time, with inventories already tight and OPEC+ playing hardball, the shock could be more severe.
But let’s be honest about the fiscal realities. Every pound or dollar added to the cost of a barrel is a tax on consumers and a subsidy for petrostates. For the UK, already wrestling with sticky inflation and a cost-of-living crisis, this is a nightmare scenario. The Bank of England will be watching these developments with the kind of dread usually reserved for a gilt auction gone wrong. Higher energy prices mean higher inflation, which means higher interest rates for longer. The bond market, that great barometer of future pain, is already pricing in a more hawkish BoE.
Central bank policy is caught between a rock and a hard place. The Federal Reserve, the ECB, and the BoE all want to ease off the tightening pedal, but a supply-side oil shock would force their hands. This is not demand-pull inflation; it is cost-push, and it is the worst kind for policymakers because it cannot be tamed by raising rates alone. The risk is that we get caught in a stagflationary trap: stagnant growth with rising prices.
Capital flight is also a concern. In times of geopolitical turmoil, investors seek safe havens: the US dollar, gold, Swiss francs. The pound, already under pressure from weak growth forecasts, could take another hit. Gilt yields might rise not because of confidence in UK fiscal discipline, but as a risk premium on a country heavily exposed to energy price shocks. The government’s fiscal headroom, already frayed by tax cuts and spending pledges, could vanish faster than a politician’s promise.
The irony is that Iran’s posture is partly a response to the very economic pressures it faces. Sanctions have crippled its economy, and the regime needs to demonstrate its relevance. But this is a dangerous game. Closing Hormuz would trigger a military response, likely from the US Navy, and that could escalate into a conflict that nobody wants. The market is pricing in a probability of disruption, but not yet a full-blown war. That premium could rise swiftly.
For investors, the message is clear: buckle up. Volatility is back with a vengeance. The path of least resistance for oil prices is higher, and that will ripple through every asset class. Equities will struggle as margins compress, bonds will sell off on inflation fears, and commodities will remain the only game in town. As I always say, markets hate uncertainty more than they hate bad news. And right now, the uncertainty coming out of Tehran is about as bad as it gets.
