Professor warns of Iran war supply shock in days

Source: businessinsider.com

TL;DR

• University of Chicago professor Robert Pape warns of a global supply shock from the Iran war's Strait of Hormuz blockade.
• Shortages of critical goods like fertilizers and plastics will hit within 10 days as inventories run out.
• Markets lack preparation for disruptions that go beyond oil prices to halt factories via missing materials.

The story at a glance

University of Chicago professor Robert Pape argues that the ongoing Iran war and Strait of Hormuz blockade will trigger widespread shortages soon. He bases this on his Substack newsletter and X posts, responding to recent blockade news. This comes amid weeks of conflict that have already spiked energy prices.

Key points

• Pape predicts parts of the global economy will face shortages of critical goods-not just higher prices-within 10 days due to blocked shipping.
• The shock shifts from expensive oil to missing inputs like fertilizers and plastics, causing factories to stop when materials fail to arrive.
• Supply chains seize up, transmitting the disruption through trade reductions where access matters more than prices.
• US energy independence offers no shield, as global trade in goods remains vulnerable.
• By the time shortages make headlines, inventories will already be depleted, making response too late.
• Pape references JPMorgan's Michael Cembalest, who notes energy shocks still hurt despite US production.

Details and context

The Strait of Hormuz blockade stems from US and Israeli strikes on Iran since February 2026, with Iran closing the key oil and gas route since early March. This chokepoint handles about 20% of global oil trade, but Pape focuses on downstream effects: petrochemicals for plastics, fertilizers tied to food production.

Past oil crises like the 1970s showed price spikes, but Pape sees this as worse due to just-in-time inventories that leave little buffer today. Factories halt not from cost but absence of parts, echoing supply snarls from COVID or Ukraine war but amplified by energy centrality.

Key quotes

• "Within 10 days, parts of the global economy will start running short of critical goods. Not just higher prices - Shortages. Markets are not ready for this." — Robert Pape, X post[[1]](https://www.businessinsider.com/professor-predicts-iran-war-supply-shock-for-global-markets-oil-2026-4)
• "Once inventories run down, this stops being about expensive inputs. It becomes about missing inputs. Factories don't slow because costs rise. They stop because materials don't arrive." — Robert Pape[[1]](https://www.businessinsider.com/professor-predicts-iran-war-supply-shock-for-global-markets-oil-2026-4)

Why it matters

The blockade risks turning a regional war into broad economic pain through shortages that hit manufacturing, food, and consumer goods worldwide. Investors and businesses face factory shutdowns and price surges on everyday items, while households see higher costs for basics like groceries and plastics. Watch if Hormuz shipping resumes soon; prolonged closure could deepen the shock, though military action adds uncertainty.[[1]](https://www.businessinsider.com/professor-predicts-iran-war-supply-shock-for-global-markets-oil-2026-4)