MORROWFLY
Guided scenario

What if traffic through the Strait of Malacca is disrupted?

Malacca carries 21% of global maritime trade by value (CSIS 2026, $2.46T). This models a disruption on the Ever Given template — throttling and delays, not a full closure, for which no measured analog exists.

1The setup

The Strait of Malacca carries 21% of global maritime trade by value — $2.46T on the strict CSIS 2026 measure. No closure has ever been measured at Malacca, so this guide models a disruption on the Ever Given template instead: Suez's 6-day blockage in March 2021 causally raised the World Container Index 40% (peer-reviewed causal study) and produced multi-month supply-chain domino effects. Set how much of the strait's traffic is disrupted and for how long; the grading line is ≥7 consecutive days closed or throttled.

2Right now

container-shipping

INCOMPLETE

Coverage incomplete — the monitor is missing feeds for container-shipping, so no score is shown. Incomplete coverage is not zero risk.

Monitor data as of Sep 24, 2026. Scores are observed readings, not forecasts.

How the shock travels

Container reroute → freight spike

Ever Given's 6-day Suez blockage causally raised the World Container Index 40% (peer-reviewed causal-inference study, 99.89% confidence). A Malacca closure forces Lombok/Sunda detours with the same distance-cost mechanics.

Evidence: ScienceDirect causal study — +40% World Container Index, Ever Given 23–29 Mar 2021; Reuters — Lombok/Sunda bypass adds journey time

China crude supply shock

China imported nearly 8 mb/d of crude through the strait in 1H25 (WSJ), and 23.2 mb/d of total oil transited Malacca in 1H25 — the world's largest oil chokepoint (EIA chokepoints, Mar 2026).

Evidence: EIA World Oil Transit Chokepoints (Mar 2026) + WSJ — 23.2 mb/d total, ~8 mb/d China-bound

Caveat: UNVERIFIED as a measured closure outcome — structural from EIA/WSJ flow data; no pipeline alternative exists at that scale

LNG tightness to Northeast Asia

9.0 Bcf/d of LNG transited Malacca in 2023 (EIA 2024 chokepoints report), bound in large part for Japan, Korea, and Taiwan.

Evidence: EIA 2024 chokepoints report — 9.0 Bcf/d through Malacca

Caveat: UNVERIFIED as a measured closure outcome — the volume figure is measured, the price pass-through is not

Manufacturing supply-chain cascade

About 21% of global maritime trade by value funnels through one strait (CSIS); Ever Given showed a 6-day chokepoint closure producing multi-month supply-chain domino effects.

Evidence: CSIS 2026 — $2.46T / 21% of global maritime trade; cresteconomics on the Ever Given domino effects

War-risk insurance for the strait

Insurance withdrawal is the channel that empties a strait commercially before it empties physically — seen in Hormuz in 2019 and the Red Sea in 2023–25.

Evidence: Structural mechanism from the Hormuz and Red Sea analogs

Caveat: UNVERIFIED — no measured Malacca war-risk precedent located

3The exposure

Coverage incomplete — the monitor does not track exporter shares for container shipping. The exposure for this scenario is sized from the declared capacity snapshot in the “Adjust the assumptions” section below instead.

Shipping lane

What passes through Strait of Malacca

lane throughput · not a goods flow

The strait's container exposure is a throughput share, not a country-to-country goods flow. Exposure here is throughput concentration — how much shipping uses the lane — not who imports from whom.

  • 21%

    CSIS, 2026

    Share of global maritime trade by value passing through the strait

    global maritime trade by value, ~$2.46T — All-vessels figure, not container-only.

  • 41.12M TEU

    Maritime and Port Authority of Singapore (MPA), 2024

    Container throughput at the Port of Singapore (the strait's hub port)

    annual port throughput, 2024 — ~90% transshipment; world's largest transshipment hub, 2nd-busiest container port. source

Container-only share of strait transits (TEU basis): unknown — No sourced container-only transit share found; the 21% is all maritime trade by value.

How we map this

Container shipping is a service, not a goods flow: there is no honest HS-code bilateral to attach to a strait. So this card measures the lane itself — transit shares, port TEU, gateway concentration — each figure sourced with its vintage. What a disruption does to prices or shortages is not modeled here.

4Adjust the assumptions

100%

Historical check: No container shipping episode on record — no historical range to compare this setting against.

What share of the exposed capacity is disrupted.

Resolution: Share of strait traffic disrupted (littoral-state notices / AIS)

Share of global maritime trade by value in the hazard zone

Global maritime trade transiting the strait — 21.0% of global maritime trade by value

Exposed under your assumptions: 21.0% (21.0% × 10000% severity) — verified route share factored in; see “What this assumes”.

The hatched area is modeled from your assumptions, not a measured outcome.

Source: CSIS 2026 ($2.46T)

Exposed ≠ lost — affected trade can reroute, draw stocks, or substitute. This sizes the exposure, not the damage.

14d

Historical check: No container shipping episode on record — no historical range to compare this setting against.

Resolution: Consecutive days the strait is closed or throttled to commercial traffic — grading threshold 7 days (Ever Given lasted 6)

60d

Your assumption — not a measured buffer.

Resolution: Assumed days of stockpile cover — an assumption, not a measured buffer

Disruption timeline
090180270365 days
Disruption: 14 days
Assumed cover: 60 days — your assumptionYour assumption

Covered by stockpiles— the assumed cover outlasts the disruption

What this would have meant

At these settings, about 21.0% of the world's container shipping exports would be exposed to the disruption, and the 60-day assumed stockpile cover outlasts the 14-day disruption.

No close historical match in our records — this scenario is outside our recorded experience.

What this assumes
  • Exposure: Target share 21.0% × severity 100% = 21.0% exposed.
  • Uncovered days: max(0, 14 − 60) = 0.
  • Exposed ≠ lost: affected trade can reroute, draw down stocks, or find substitutes — this number sizes the exposure, not the damage.
  • Exporter share ≠ spare capacity: rivals may not be able to surge supply to fill the gap.
  • Stockpile cover of 60 days is your assumption, not a measured buffer.
  • Results are physical-exposure arithmetic from your stated assumptions — not a price forecast.

Analog check

No close historical match in our records — this scenario is outside our recorded experience.

Want the full controls? Reopen container shipping on its commodity page.

5What happened before

For perspective, not prediction

Ever Given blocks the Suez Canal (March 2021)

Mar 23 – Mar 29, 2021

“A 400m ship blocked Suez for six days and 400+ vessels queued — oil wobbled $2.60 and reversed, and no verifiable agricultural price reaction followed. A timing shock, not a supply shock. Kept in the dataset only as an explicitly limited non-attribution case.”

Price moves were observed around the event — not proof the event caused the entire move.

Read the full record

Red Sea / Houthi shipping disruption (2023–24)

Nov 2023 – Apr 2024

“Houthi attacks rerouted a third of Red Sea container traffic and roughly halved Suez trade — and grain prices fell anyway on record supply. The freight shock lived in shipping rates, not commodity prices.”

Price moves were observed around the event — not proof the event caused the entire move.

Read the full record

What to watch

  • AIS vessel counts through the strait — 102,500+ ships transited in 2025 (Malaysia Marine Department via Reuters)
  • Notices to mariners from the littoral states (Indonesia, Malaysia, Singapore)
  • Drewry World Container Index — the Ever Given template causally raised it ~40%
  • Whether carriers are reported rerouting via Lombok/Sunda at added journey time
  • War-risk-insurance lines for the strait — no measured Malacca precedent exists

Curated by Morrowfly — these are things to check, not monitor conditions.

Make it yours

Your call, in your words — recorded privately on this device, with a check-back in 30, 60, or 90 days.

Tell us

Spotted something wrong, confusing, or missing? It goes straight into our improvement queue.

Something off? Tell us.

Read by a human · never auto-published

Illustrative scenario. Not a prediction. Not financial advice.

Monitor data as of Sep 24, 2026 · Trade vintage 2024 · Scoring v3.2

What if traffic through the Strait of Malacca is disrupted? | Morrowfly