What if copper smelting fees turn negative?
The 2027 copper-concentrate benchmark settling negative forces major Chinese smelter closures, paradoxically tightening refined copper even amid weak China growth — the move is refined copper and Freeport higher on lost smelting, with the China-growth-down legs capping it. Rhymes with the early-2024 TC/RC collapse toward zero after the Cobre Panama loss, which forced CSPT smelter-cut talks and lifted copper. Forward angle: negative TCs mean smelters pay for concentrate — unsustainable, so capacity rationalizes structurally, removing refined supply into rising grid/AI demand; the trade is the refined-vs-concentrate squeeze, long copper against smelter margins.
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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 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…
What it would mean
If this plays out, it is a mixed shock. The 2027 copper concentrate benchmark settles outright negative, forcing major Chinese smelter closures and tightening refined copper. :: The trigger decomposes into signed root‑shocks — Copper ▲ · China growth ▼ — which propagate through our causal graph to the markets below.