Counterparty risk

Counterparty risk is the risk that the other party to a financial contract will default before fulfilling its obligations, leaving the non-defaulting party with an unhedged exposure and a legal claim of uncertain value. It is the fundamental risk of trust in financial markets — the risk that a promise to pay will not be kept. In bilateral markets, counterparty risk accumulates opaquely across a dense web of interbank exposures, making it impossible for any participant to assess the true risk of the system. The 2008 crisis demonstrated that counterparty risk is not merely a bilateral concern but a network property: the solvency of each node depends on the solvency of its neighbors, and the network as a whole can collapse when trust evaporates. The shift to central clearing was the regulatory response, though it substitutes distributed counterparty risk for concentrated hub risk — a tradeoff whose systemic consequences are still unfolding.

The quantification of counterparty risk in modern derivatives markets relies on Credit valuation adjustment (CVA) models, which attempt to price the expected loss from counterparty default into the contract's valuation. But CVA itself embeds a network assumption — that the counterparty's default probability is independent of the dealer's own default probability — an assumption that collapses when systemic correlation rises.