When a lorry brings food to your local shop, it runs on fuel, and fuel starts with oil. Much of that oil sails through one narrow sea lane, the Strait of Hormuz, between Iran and the countries of Oman and the United Arab Emirates.
Here is the surprise. Data firm Kpler says Gulf countries sent out 24.6 million barrels a day in the week to 18 October, more than before the war. Yet on Friday 30 October Brent, a price many countries follow, briefly went above $117 a barrel, its highest since April.
Why? Oil is taking costlier routes. Shuttle boats pass it to tankers waiting off Oman and the UAE, and moving a barrel has cost about $40 lately, around ten times normal, says LSEG, another data firm. October was also the deadliest month for attacks on merchant ships since the war began, with 32 incidents logged by UKMTO.