Chokepoints: The Geography Markets Keep Forgetting
Most of the world economy fits through five narrow stretches of water. Markets remember this roughly once a decade, always with surprise.
Every few years a canal gets blocked, a strait gets threatened, or a shipping lane becomes a shooting gallery, and suddenly analysts rediscover that globalisation has physical geography. The infrastructure of world trade is astonishingly concentrated, and that concentration is a permanent, underpriced feature of markets. A short tour of the five chokepoints worth knowing.
1. The Strait of Hormuz
The one everyone knows, for good reason: roughly a fifth of the world's oil and a large share of its liquefied natural gas exits the Persian Gulf through a channel whose shipping lanes are only a few kilometres wide, bordered by Iran on one side. There is no meaningful maritime alternative; pipelines across Saudi Arabia and the UAE can divert only a fraction of the flow. That's why any Iran crisis is immediately an oil-price event, and why the mere threat of closure moves markets even when tankers keep sailing. Hormuz is less a trade route than a standing option on chaos, permanently embedded in the oil price.
2. Suez and Bab el-Mandeb: one route, two doors
The Suez Canal carries somewhere around a tenth of global trade between Asia and Europe, but a ship that uses Suez must also pass Bab el-Mandeb, the strait at the Red Sea's southern mouth, flanked by Yemen. This pairing is the route's weakness: securing the canal is pointless if the southern door is unsafe, as the Houthi attacks of 2023-24 demonstrated when much of container traffic simply diverted around Africa, adding roughly ten days and real cost to Asia-Europe shipping.
"Chokepoints come in series, and the weakest link prices the route."
3. The Strait of Malacca
Between Malaysia, Singapore and Indonesia runs the artery of Asian trade: a huge share of China's, Japan's and Korea's energy imports, plus much of the container traffic feeding the world's manufacturing heartland. Strategists in Beijing have worried for two decades about the "Malacca dilemma": the fact that a hostile navy could, in theory, throttle China's economy at a point it doesn't control. Much of China's grand strategy, from overland pipelines through Myanmar and Central Asia to the naval build-up, is best understood as an attempt to buy insurance against this single map feature.
4. The Panama Canal
The Western Hemisphere's shortcut has a different vulnerability: water. The canal's locks rely on rainfall-fed lakes, and recent drought years forced authorities to cut daily transits, sending shippers back around Cape Horn or overland. Panama is the reminder that not every chokepoint risk is geopolitical; climate can close a trade artery as effectively as a navy, and with even less warning.
5. The Turkish Straits
The Bosphorus and Dardanelles are the Black Sea's only exit, which makes them the export route for a large share of the world's grain, plus Russian and Kazakh oil. They are governed by a 1936 treaty (Montreux) that gives Turkey discretion over warship passage, quietly making Ankara a gatekeeper of both commodity flows and naval power in the region. The grain-price spikes after 2022 were, at bottom, a chokepoint story.
Why this matters for your portfolio view
Three takeaways. First, chokepoint risk is asymmetric and lumpy: nothing happens for years, then a single event reprices freight, insurance, energy, and inflation expectations together. Second, markets systematically under-price it in calm periods because it doesn't show up in quarterly data; there is no line item for "the strait stayed open." Third, the honest indicators are physical, not financial: tanker transit counts, war-risk insurance premia, and shipping rates tell you what's actually happening long before official statements do.
Geography doesn't appear on a balance sheet. It should.