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The verdict

What if Black Sea grain stops?

For this scenario, about 19.3% of the world's wheat exports would be exposed to the disruption, and the disruption runs 90 days against 60 days of assumed stockpile cover, leaving about 30 days beyond what the assumed stockpile covers.

In the recorded Black Sea, 2022 analog, wheat futures rise +62.7% in 12 days (23 Feb 2022 → 7 Mar 2022), and for consumers: retail bread (US) rose +7.2% to +11.3% over 4–6 months. Illustrative — what happened then, not what will happen now.

Exposed ≠ lost. Illustrative scenario. Not a prediction. Not financial advice.

Model the shock

80%

Share of the focus exporter's shipments disrupted

90d

Days the disruption lasts

60d

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

What to watch

  • Whether Ukraine's Black Sea grain ports are reported loading and shipping
  • Fresh export-restriction or corridor-closure headlines affecting wheat trade
  • The 20-day wheat price change against the monitor's −10% invalidation-style line

Evidence: Adapted from the commodity monitor's thesis invalidation conditions (thesis elnino-rice-wheat-2026: invalidation "wheat 20d price change falls below -10%", confirmation keyed to "fresh export restriction headlines (India/Thailand/Vietnam)" for rice) — watch items, not monitor conditions.

Make your call

Not a bet, not financial advice. Write your one-line read — we check back on January 13, 2027 and grade it in public.

How we model thisThe full evidence, assumptions, and arithmetic — analyst layer.
Guided scenario

What if Black Sea grain stops?

Russia and Ukraine together are a quarter of world wheat exports. Explore the exposure.

1The setup

Russia (15.8%) and Ukraine (8.3%) together account for 24.1% of world wheat exports by value (2024 vintage) — and Ukraine alone is 13.1% of world corn exports. Both countries move their grain through the Black Sea. This guide walks through what the monitor is seeing right now, how exposed each market is, and lets you model a stoppage yourself.

Market check · Polymarket

What the market thinks

Russia x Ukraine ceasefire agreement by...?

Polymarket · live contract

14%

implied chance of “Yes” on Russia x Ukraine ceasefire agreement by December 31, 2026…

The market says 14% — you say the real chance is…

Your take lives on this device only. Illustrative — not a bet, not advice.

Closest live contract — the conflict this scenario is about, not grain exports. The scenario asks what happens if the conflict continues; the market prices the ceasefire outcome.

$10.6M traded · resolves by 2027-07-01Odds as of Nov 9, 2026, 16:09 UTCView this market on Polymarket →

Illustrative only — not financial advice, not a recommendation.

Two markets · one story

Contract odds vs WTI spot · resolves Dec 31, 2026

“Russia x Ukraine ceasefire agreement by December 31, 2026?”, the Polymarket contract this scenario maps to, next to the WTI spot for the same days.

Nov 9, 2026

Odds 14.5%

WTI spot $99.64 (as of Nov 3, 2026)

Polymarket odds, Yes (Ceasefire odds)

11%17%22%

WTI spot, dollars per barrel (EIA)

$85$98$111Sep 20, 2026Nov 9, 2026

Since Sep 20, 2026: Ceasefire odds -7.0 pts; WTI spot +2.8%.

Daily snapshots of the contract's Yes price, and the EIA spot price for the same days. Gaps in a line are days with no published value; the line is never filled in. Shown side by side for context: the contract prices an event, the spot series is a commodity price, and neither one is a forecast of the other.

Odds: Polymarket, daily snapshots as published by Morrowfly. Spot: Source: U.S. Energy Information Administration (Nov 2026); Cushing, OK WTI Spot Price FOB (dollars per barrel); daily, latest observation Nov 3, 2026. EIA publishes this series with a lag.

2Adjust the assumptions

80%

Historical check: The closest episode, Black Sea, 2022, saw wheat futures move +62.7% (extreme band); your 80% disruption setting sits in the extreme band.

What share of Russia + Ukraine’s wheat exports is disrupted.

Resolution: Share of the focus exporter's shipments disrupted

90d

Historical check: The closest episode, Black Sea, 2022, lasted 148 days (medium); your 90-day duration sits in the medium band.

Resolution: Days the disruption lasts

60d

Your assumption — not a measured buffer.

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

What this assumes
  • Exposure: Target share 24.1% × severity 80% = 19.3% exposed.
  • Uncovered days: max(0, 90 − 60) = 30.
  • 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.
  • Combined share is the sum of the focus exporters' individual shares — a scenario hitting all of them at once.
  • 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.
Share of world exports

Russia + Ukraine wheat — 24.1% of world Wheat exports (Share of global export value (USD) — 2024 vintage)

Exposed under your assumptions: 19.3% (24.1% × 80% severity)

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

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

Disruption timeline
090180270365 days
Disruption: 90 days
Assumed cover: 60 days — your assumptionYour assumption

30 days buyers can't ride out — not automatically a physical shortage

What this would have meant

For this scenario, about 19.3% of the world's wheat exports would be exposed to the disruption, and the disruption runs 90 days against 60 days of assumed stockpile cover, leaving about 30 days beyond what the assumed stockpile covers.

In the recorded Black Sea, 2022 analog, wheat futures rise +62.7% in 12 days (23 Feb 2022 → 7 Mar 2022), and for consumers: retail bread (US) rose +7.2% to +11.3% over 4–6 months. Illustrative — what happened then, not what will happen now.

Analog check

Your settings look closest to Black Sea, 2022 (same commodity, same shock type, similar size, similar duration, similar supply concentration). The episode's measured moves, caveats included: wheat futures +62.7% in 12 days (23 Feb 2022 → 7 Mar 2022); Retail bread (US): +7.2% to +11.3% over 4–6 months. 2022's bread move also reflects soaring natural-gas and diesel costs (fertilizer and freight) and broad post-pandemic food inflation — not all of it traces to the wheat shock..

Only about 11.8¢ of every US consumer food dollar — and 18.5¢ of every food-at-home dollar — reaches the farm (USDA, 2024) — that's a ceiling, not a prediction: margins can absorb a spike or amplify it.

Illustrative — what happened then, not what will happen now. Your scenario differs: your scenario is a hypothetical — the episode is history, and its prices moved with the whole economy (energy, freight, demand), not just this shock.

Read the full record
How we matched this
  • Commodity: requirement — Both are wheat — non-wheat episodes are excluded outright.
  • Shock type: 2/2 — Both are a conflict shock.
  • Size: 1/1 — Your 80% disruption setting band: extreme; episode futures moved +62.7% (23 Feb 2022 → 7 Mar 2022) — band: extreme. Severity is % of shipments disrupted, not a price move: this banding is a v1 matching heuristic.
  • Duration: 1/1 — Your disruption: 90-day (medium); episode: 148-day (medium) — Ukrainian commercial shipping suspended 24 Feb 2022; Black Sea Grain Initiative signed 22 Jul 2022 (repo event records russia-ukraine-war, bsgi-exit-2023).
  • Supply concentration: 1/1 — Your hazard zone: 24.1% of world exports (moderate); episode disrupted ~30% (moderate) — Russia and Ukraine together were about three-tenths of world wheat exports (Reuters, Mar 2022 — repo event record russia-ukraine-war).

Score 5/5 — close analog (headline).

Want the full controls? Reopen wheat on its commodity page.

3Right now

Wheat

QUIET

Stress 2/10

  • ZWZ26.CBT Dec-2026 contango (stable) — deferred premium, near-term supply ample
  • Odesa: week-ahead forecast shows dry rainfall
  • Inventories tightening — 122.3 days of cover; pctile 15.0 vs history; week ending 2026-10-29

Corn

QUIET

Stress 3/10

  • ZCZ26.CBT Dec-2026 contango (stable) — deferred premium, near-term supply ample
  • Des Moines: week-ahead forecast shows severe deficit rainfall
  • Champaign: severe deficit rainfall — 36% of the 30-day normal

Monitor data as of Nov 9, 2026. Scores are observed readings, not forecasts.

4The exposure

Disruption hits:
  • Russia
    15.8%
  • Canada
    13.6%
  • United States
    11.7%
  • Australia
    9.9%
  • Ukraine
    8.3%
Share of global export value (USD) — 2024 vintage. Amber = the scenario focus. Ranked by share.

How the shock travels

Follow the shock downstream — from the wheat market, through processors, to the shelf. These are the usual stages, not this scenario's outcome: exposure at each step, never a prediction.

  1. Day 0: wheat futures spike

    timing not established

    Lag basis: lag not established in sources reviewed

    wheat futures

  2. Flour millers and wholesale wheat flour

    typically within ~1 month →

    Lag basis: USDA ERS Amber Waves (June 2011): most of a farm wheat price change was passed on to wholesale wheat flour prices within the first month

    wheat flourbulk flour

  3. Bread, pasta and cereal on the shelf

    typically 1–6 months →

    Lag basis: USDA ERS (Leibtag, 2009, cited in USDA presentation): retail bread pass-through time 1 to 6 months; Amber Waves (June 2011): wholesale flour to retail bread mostly after 2–4 months when wholesale prices fell or rose modestly, within the first month during surges

    breadpastacerealbaking mixes

    General Mills

    GIS

    Grains including wheat and corn are listed as principal ingredients, and wheat is used across its cereals, baking mixes and flour products

    Source: General Mills 10-K (SEC)

Illustrative scenario. Not a prediction. Not financial advice. Company entries describe factual exposure to the commodity — not a view on any stock.

Trade map

Who ships it, who can’t do without it

2024 vintage · annual data, 1–2y lag

Sourced trade structure — the scenario’s shock geography at country resolution. Exposure, not a forecast.

Wheat · Russia + Ukraine

Top exporters

  • Russia

    15.8% of world exports

  • Canada

    13.6% of world exports

  • United States

    11.7% of world exports

  • Australia

    9.9% of world exports

  • Ukraine

    8.3% of world exports

Note: wheat and meslin; durum not split Build used 6-digit 100111/100119/100191/100199.

Exposed importers

Shocked exporters: Russia, Ukraine

Black Sea export corridor

via Turkish Straits (Bosporus/Dardanelles) · 20% of global wheat exports

Source: Chatham House, 2015 (published 2017)

Everything through the Turkish Straits →

Suez Canal (Black Sea/EU wheat to Asia lane)

via Suez Canal · 97% of EU/Russia/Ukraine wheat shipments to selected Asian countries and Eastern Africa transiting the Suez Canal, pre-crisis baseline

Source: WTO Wheat Dashboard (via agbi.com / freightnews.co.za, 2024-01), 2023 (pre-Red Sea crisis baseline)

Everything through the Suez Canal →

How we map this

Exporter and importer shares are 2024 vintage · annual data, 1–2y lag from UN Comtrade and OEC (BACI/CEPII); an importer counts as exposed when ≥20% of its wheat imports come from a shocked exporter. The shock geography is the scenario’s own focus selection. Annual data with a 1–2 year reporting lag — the structure moves slowly, the prices don’t.

5What happened before

For perspective, not prediction

Russia invades Ukraine: the Black Sea grain and fertilizer shock

Feb 2022 –

“Chicago SRW wheat futures rose early in 2022 and later gave back part of that rise. The Black Sea disruption and subsequent changes in trade and supply are documented, but these price windows do not isolate the war’s effect or show where prices would have been without it.”

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

Read the full record

Russia exits the grain deal: Chicago wheat rises, then falls

Jul 2023

“Chicago SRW wheat (ZW=F) rose 4.6% from Jun to Jul 2023 month-end, then stood 14.9% below June by September. The later decline does not show that leaving the grain deal had no bullish effect; prices might have fallen further without it.”

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

Read the full record

Russia’s 2010 grain ban: Chicago wheat across the ban window

Aug 2010 – Jun 2011

“Chicago SRW wheat (ZW=F) was up 20.1% from Jul to Dec 2010 month-end, but down 11.6% from Jul 2010 to Jun 2011. Different endpoints give different descriptions; neither comparison measures the ban’s price effect or proves that competitors fully offset it.”

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

Read the full record

What to watch

  • Whether Ukraine's Black Sea grain ports are reported loading and shipping
  • Fresh export-restriction or corridor-closure headlines affecting wheat trade
  • The 20-day wheat price change against the monitor's −10% invalidation-style line
  • Reported vessel traffic on the Suez Asia lane — the measured 97% route share is a 2024 figure

Adapted from the commodity monitor's thesis invalidation conditions (thesis elnino-rice-wheat-2026: invalidation "wheat 20d price change falls below -10%", confirmation keyed to "fresh export restriction headlines (India/Thailand/Vietnam)" for rice) — watch items, 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

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Read by a human · never auto-published

Illustrative scenario. Not a prediction. Not financial advice.

Monitor data as of Nov 9, 2026 · Trade vintage 2024 · Scoring v3.4

Where this happened before

Related scenarios

What if Black Sea grain stops? | Morrowfly