A commodities trader sells a put option to a mining company hedging its gold exposure. Gold collapses 40%. The option moves deep in-the-money — the trader is owed significant value. Simultaneously, the mining company's credit quality deteriorates sharply. The counterparty most likely to default is now the one that owes the most. That is wrong-way risk in one paragraph.
Wrong-way risk (WWR) exists when the probability of counterparty default is positively correlated with the exposure itself. Specific WWR involves a direct link — a bank selling credit protection on its own parent entity. General WWR is macro-driven: an Australian exporter receiving USD payments from a counterparty whose creditworthiness degrades precisely when AUD/USD moves adversely. Both variants destroy the diversification assumption baked into standard credit models.
Quantifying the impact requires moving beyond standard Expected Exposure (EE) calculations. Under a naïve model, a 5-year interest rate swap with a BBB counterparty might carry a Credit Valuation Adjustment (CVA) of 45 basis points. Introduce a 0.6 positive correlation between the counterparty's default probability and the swap's mark-to-market value, and that CVA can escalate to 110–140 basis points — a 2.4× to 3.1× multiplier. The exposure is no longer mean-reverting; it is directionally adversarial.
Practical risk frameworks address WWR through three mechanisms: stress-conditioned exposure simulation (running market scenarios conditional on counterparty distress), collateral haircut escalation for correlated counterparties, and trade-level notional limits when sector concentration creates macro WWR. Basel III formalised the CVA capital charge under CRR Article 384 precisely to force institutions to capitalise this correlation risk explicitly rather than absorbing it silently. Traders working within institutional frameworks can study the mechanics via Investopedia's wrong-way risk reference, examine the structural definitions through Wikipedia's wrong-way risk entry, and review the original regulatory intent in the Basel III framework overview.
The bridge does not fall because the engineer assumed the load and the storm would never coincide. Wrong-way risk is that coincidence — modelled, measured, and priced, or eventually paid for in full.
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