Geopolitics risk-off · 6–18 months
A what‑if from the future

What if an Iran-backed Shia uprising erupts in Bahrain?

An Iran-backed Shia uprising in Bahrain threatens the US Fifth Fleet and, by proximity, Hormuz/Saudi Eastern Province -- so the +3.6% Brent is really a Hormuz-spillover premium, not Bahrain's own (negligible) output. Rhymes with the 2011 Bahrain uprising, crushed by the Saudi-led GCC Peninsula Shield intervention, which kept oil calm. Transmission: Bahrain is a Saudi client (causeway, bailouts) and US naval hub; the genuine risk is Saudi/Iranian escalation. Forward: any sign of a 2011-style Saudi intervention caps the premium quickly.

8%
our model probability
over 6–18 months
prediction markets — the market's odds
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Anchored to measured history 8% · 90% range 1–15% · 40 dated precedents behind it — a wider range means thinner evidence

Every number ships with its receipt — the odds, the range, the precedents, and a public grade at Reality Check. The statistical machinery that produces it is proprietary.

The butterfly cascade

How this trigger trickles across markets, left → right — the root shock, its first‑order moves, then the ripple effects. Drag any node; tap a market for its real price history.

Resolution timeline — how this probability is moving

Our model's odds (electric blue) over time vs the market's (Polymarket, amber), from the past toward the 6–18 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…

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What it would mean

If this plays out, it is a risk-off shock. A mass Shia uprising in Bahrain, backed by Iran, threatens the US Fifth Fleet's home base and Gulf stability. The trigger decomposes into signed root‑shocks — Geopolitical risk ▲ · Oil supply risk ▲ — which propagate through our causal graph to the markets below.

Methodology. Probability and impact are anchored to history and scored against what actually happens — wins and losses, in public, at Reality Check. Market odds live from Polymarket & Kalshi. By Vikas Singh, Quantitative Strategist. Updated 2026-08-13.