What if a low Mississippi River strands US grain exports?
Low Mississippi at harvest is a US export-basis and barge-freight event — short Gulf corn/soy basis and long barge rates, with CME flat price actually capped as export demand backs up. Rhymes with the autumn 2022 and 2023 low-water episodes that sent St. Louis barge freight to records and widened Gulf basis. Transmission is US competitiveness vs Brazil at the Asian/China buyer; CORN flat-price up is partly offset by the export-logjam, a nuance the cascade misses.
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The butterfly cascade
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Our model's odds (electric blue) over time vs the market's (Polymarket, amber), from the past toward the 0–6 months horizon. Each dot is a real macro event that nudged the probability — green pushed it up, red pushed it down. Tap a dot for the source. Loading the probability audit trail…
What it would mean
If this plays out, it is a mixed shock. Record-low Mississippi River levels halt grain barges at harvest, stranding US corn and soy exports at the Gulf. The trigger decomposes into signed root‑shocks — Climate/crop supply ▲ · Food inflation ▲ — which propagate through our causal graph to the markets below.