Markets may look diversified until they rely on backup routes — that’s when resilience becomes real.

In energy systems, supply depends not only on production and demand but on whether oil can move through key corridors efficiently. When transport capacity tightens, spare production may not matter.

In early March 2026, the Iran war disrupted oil flows through the Strait of Hormuz, forcing Saudi Arabia to reroute crude to the Red Sea port of Yanbu via the East-West pipeline. Yanbu loadings rose to about 2.2 million barrels per day in early March, up from 1.1 million in February, with Aramco expecting the pipeline to approach its 7 million-barrel capacity. Before the disruption, about 6 million barrels per day had moved through Hormuz.

The rerouting prevented an immediate supply collapse but revealed the constraint: Hormuz wasn’t replaced — just shifted onto a narrower backup route while Red Sea risks remained.

A common assumption during disruptions is that redundancy solves fragility, but that is only partly true. Backup routes reduce risk but rarely remove the underlying concentration. Instead, they shift dependence onto fewer alternatives, leaving less room for error and tighter tolerance for shocks.

In this case, more flow is forced through pipelines and westbound export routes because the main maritime corridor is impaired. Narrow systems don’t fail only when flow stops — they weaken when optionality disappears.

Financial markets treat oil as liquid because it’s continuously priced and hedged, but pricing liquidity is not the same as physical mobility.

When a key corridor is disrupted, preserving supply continuity becomes costlier — through contracts, shipping, storage, and insurance. Producers reroute, buyers accept delays, and carriers reprice risk. These shifts can be significant even without a shortage.

The constraint appears first as lost flexibility, not higher prices. Markets remain open, but under increasing strain and worsening terms.

When an energy corridor tightens, stress spreads beyond its origin.

It begins in shipping and insurance, then moves to refiners, importers, and transport-intensive sectors. At first it shows up as higher delivery risk and wider costs before feeding into prices, margins, and investment decisions.

What spreads is not just higher oil prices, but the cost of operating with less logistical freedom.

What persists: centrality of physical routing in energy markets. Production remains important, but movement is what converts production into usable supply.

What can fail: assumption that substitute infrastructure restores normality. It can preserve function, but usually under narrower conditions and with less tolerance for additional stress. Once the backup route becomes the main route, the system is no longer diversified in the way prices may imply.

The real issue in bank capital is not whether safety is good or lending is good. Both are necessary. The issue is that they draw on the same balance sheet. That is why banking systems remain permanently constrained.