Maritime chokepoint
A narrow passage that a large share of world trade must transit, where disruption forces long re-routing rather than a small delay.
A maritime chokepoint is a strait or canal through which a disproportionate share of seaborne trade passes, and for which the alternative is significantly longer. The category is small and stable - a handful of passages carry a large fraction of world commerce - which is exactly what makes them fragile.
Their importance is that disruption is not proportionate. Where a chokepoint is avoided, the alternative routing typically adds one to three weeks of transit, which consumes vessel capacity fleet-wide and tightens freight rates far from the incident. A single blockage is therefore a global capacity event rather than a local delay, and the effect appears in lanes that never used the passage.
Because the re-routing is visible in vessel movement as it begins, a chokepoint event is one of the few disruptions that can be read in near real time. Whether it matters to a particular buyer depends on whether their long-lead equipment is on the water behind it, which is a relationship question rather than a news one.
Evidence that keeps pace with the decision.
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