What if a major member quits the EU and fractures the euro?
An EU member voting out is fundamentally a EUR-redenomination shock, so the cleanest trade is short EUR/USD (the dominant DXY leg) with peripheral spreads widening, while US equities take a secondary risk-off hit. Direct rhyme is the Jun 2016 Brexit referendum, which gapped GBP ~8% overnight and bid the dollar and gold. Forward angle: an exit by a euro-zone member (unlike non-euro UK) raises true currency-breakup risk, so the BTP-Bund spread, not just the FX rate, becomes the instrument that prices the tail.
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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 3–10 years 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 risk-off shock. A major EU member votes to leave, fracturing the bloc and the euro. The trigger decomposes into signed root‑shocks — Geopolitical risk ▲ · US dollar (DXY) ▲ — which propagate through our causal graph to the markets below.