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Red Sea / Houthi shipping disruption (2023–24)

Nov 2023 – Apr 2024

The lesson: 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.

What happened

The transmission ran through freight cost, voyage time and insurance premia — shippers absorbed roughly $1M extra fuel per Asia–Europe round trip (Xeneta) — not through physical destruction of supply. Grain exporters rerouted rather than withheld: the Houthis publicly offered safe passage to Russian and Chinese vessels, and Russian shipments continued substantially — though the assurances were imperfect: vessels carrying Russian commodities were attacked, and reporting put roughly one in five of listed incidents on ships whose most recent port call was Russia (consistent with reporting, not individually audited). The obvious thesis was that logistics friction would raise delivered prices and spill into benchmark prices; instead the pain showed up in importers' delivered costs and shippers' margins, not in FOB grain prices — and importers waited, 'holding off on purchases, anticipating further price declines' (Hellenic Shipping News, March 2024).

What everyone expected

Rusagrotrans analysts (via Interfax, January 22, 2024): 'It is possible that the situation in the Red Sea could also become a factor which will cause prices on the grain market to increase,' noting that COVID-era shipping slowdowns had raised logistics costs and prices for both importing and exporting countries. The IMF warned disruptions 'could potentially affect inflation rates due to increased shipping costs' (gCaptain, 2024).

What actually happened

  • Wheat
    Nov 2023 → Apr 2024 · ZW=F month-end closes
    +2.6%

    Essentially flat through the worst of the disruption — the freight shock did not reach the futures price.

  • Corn
    Nov 2023 → Apr 2024 · ZC=F month-end closes
    -4.8%

    Fell modestly; ample supply dominated.

  • Soybeans
    Nov 2023 → Apr 2024 · ZS=F month-end closes
    -14.7%

    Fell hard on the Brazilian harvest — logistics friction was irrelevant next to supply.

  • Sugar
    Nov 2023 → Apr 2024 · SB=F month-end closes
    -24.3%

    Fell hard on its own fundamentals.

  • Cotton
    Nov 2023 → Apr 2024 · CT=F month-end closes
    -1.9%

    Essentially flat.

  • Rice
    Nov 2023 → Apr 2024 · ZR=F month-end closes
    +8.9%

    Rose — but on the 2023 India export ban's aftermath (see that record), a separate driver.

Freight-index levels during the crisis are widely reported as surging but we did not verify a single clean contemporary quote — if the dataset needs a number, verify separately. The $1M extra-fuel figure is Xeneta via contemporary reporting. Rice's rise in the window reflects the 2023 India export ban's aftermath, a separate driver documented in this dataset.

The assessment

A shipping-cost shock that barely touched benchmark grain prices. Physical supply overwhelmed logistics friction: record Russian exports, huge Brazilian harvests and ample Northern Hemisphere supply dominated, and the largest wheat exporter received assurances and continued substantial transit, though the assurances were imperfect. The lesson: a freight crisis reprices freight, not necessarily the commodity — watch delivered costs and importer margins, not just the futures board.

How this record has changed

Living document — every material change is logged here, newest first.

  1. New evidence2026-09-21

    September 2026 brought a second Red Sea chapter: the Houthis seized Mokha port plus Perim and the Hanish islands and declared an embargo on Saudi shipping (Sep 10 statement), while Bab el-Mandeb commodity transits held near their 10-day average of ~27 vessels per day; at the same time Suez traffic rebounded — 1,232 transits (102.4m dwt) in August 2026, up 28% in volume and 43% in tonnage year on year, with July canal revenue of $505m (CAPMAS), the strongest month since Dec 2023 — partly as tankers rerouted around a disrupted Strait of Hormuz.

    Lloyd's List, 14 Sep 2026 · Reuters wire via SRN News, 11 Sep 2026

  2. Correction2026-09-15

    An independent adversarial review replaced 'insulated by safe-passage assurances' with the honest account: assurances were given and shipments continued, but they were imperfect. No new outcome data was added.

    Morrowfly internal adversarial review (15 Sep 2026)

Transmission

  • Wheat
    freight

    Wheat shipments through Suez down 40% in early Jan 2024 (WTO) — yet the futures price barely moved.

  • Corn
    freight

    Freight friction only; price fell on supply.

  • Soybeans
    freight

    Freight friction only; price fell on the Brazilian harvest.

  • Rice
    freight

    Separate driver (India ban aftermath); not a Red Sea move.

  • container/tanker freight and marine insurance
    freight

    Shippers absorbed roughly $1M extra fuel per Asia–Europe round trip (Xeneta); pain showed up in delivered costs and margins, not FOB grain prices. (not tracked commodities; the channel where the shock actually lived — Suez trade roughly halved (IMF PortWatch), detours of ~3,500 nm and 10–14+ days.)

Sources

Notes

  • Prices are month-end closes from our series unless noted; windows are labeled beside each number.
  • Secondary press quotes are reported as published and were not individually audited against primary sources.
  • Illustrative scenario record. Not a prediction. Not financial advice.