What if Italy demands an opt-out from euro debt rules?
Rome seeking a treaty carve-out on debt rules directly prices redenomination risk into BTPs — short BTPs/Italian banks and the euro, though the +7.0% VIX / -3.2% Nasdaq is a US-centric exaggeration. Rhymes with the May 2018 'Savona/parallel-currency' scare when redenomination fears gapped BTP-Bund ~150bp in days and hammered the euro. Transmission: euro-exit optionality repriced across the periphery; Bunds and the dollar bid. Forward angle: any formal opt-out talk reawakens convertibility risk the ECB's TPI is designed to suppress, so the asymmetric trade is BTP-Bund wider plus euro downside, not equities.
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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 1–3 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. Rome formally seeks treaty carve-out on debt rules, rattling redenomination-risk pricing in BTPs. The trigger decomposes into signed root‑shocks — Credit spreads ▲ · Geopolitical risk ▲ · Risk appetite ▼ — which propagate through our causal graph to the markets below.