Surging oil prices amid the Iran conflict have dominated global headlines, but beneath the surface, a series of interconnected supply shocks in lesser-known commodities are emerging as equally serious threats to the world economy.
Naphtha, a key petrochemical feedstock, rarely makes the news yet underpins production of plastics, packaging, car parts, medical supplies, and even inputs for semiconductor manufacturing. Derived from crude oil refining and cracked into ethylene and propylene, naphtha’s price typically tracks Brent crude but can diverge sharply due to petrochemical demand. Recent supply disruptions in Asia—including South Korea, where shortages have led to plastic bag rationing—have forced major producers such as LG Chem and Lotte Chemical to cut or halt operations. Japan, which imports 60% of its naphtha, sources over 70% from the Middle East; even its domestic refineries depend on regional crude, making the country especially vulnerable.
Diesel, often called “the fuel of the real economy,” powers trucks, ships, construction, mining, and agriculture. Unlike gasoline, diesel demand is relatively inelastic—consumers must keep buying even as prices rise—while refining capacity is hard to expand quickly. This makes diesel price spikes a potent driver of inflation. US diesel averaged $5.61 per gallon last week, over $2 above last year and 63 cents higher than a month earlier. Analysts warn of potential jet fuel and diesel shortages across Europe this summer, as both fuels are grouped as middle distillates and can be partially substituted.
The aluminum market is facing its largest supply deficit in 25 years, with consultancy Wood Mackenzie projecting a shortfall of up to 4 million metric tons in 2025. Prices could exceed $4,000 per ton, well above the historical norm of $1,500-$2,500. Gulf producers, responsible for about 9% of global supply, have largely halted shipments, and a missile strike damaged the UAE’s Al Taweelah smelter, with repairs expected to take up to a year. Shutting down smelters is not like flipping a switch—restarting them is technically complex and costly. Western manufacturers are bearing the brunt, partly due to tariffs and sanctions on China and Russia, both major aluminum sources.
Crack spreads—the difference between crude oil costs and refined product prices—have surged past $50, compared to a normal range of $10-$20. This reflects tight refining capacity and rising fuel costs for consumers, while refiners enjoy windfall profits.
Helium, essential for chipmaking and with no easy substitute, is facing severe supply disruptions. Qatar, producing nearly a third of global supply, saw its Ras Laffan Industrial City—the world’s largest helium site—damaged by a missile. Repairs could take five years. Helium’s specialized cryogenic transport means rerouting ships is not a viable solution, and rationing is already being reported.
Sulfur, dubbed the “king of chemicals,” is another overlooked but critical input, used in fertilizers, metal processing, and pharmaceuticals. The Gulf supplies roughly 45% of global sulfur; disruptions are already rippling through agriculture and metals. Sulfur prices have spiked, prompting Türkiye to ban exports and India to consider restrictions.
Together, these disruptions illustrate how modern supply chains—efficient in peacetime—can quickly unravel in conflict. As analyst Zoltan Pozsar notes, “global supply chains work only in peacetime, but not when the world is at war, be it a hot war or an economic war.” The convergence of failures at key chokepoints risks triggering cascading crises with lasting economic pain.
