Credit Default Swaps (CDS) and Credit Derivatives › Limitations and Risks

Despite their usefulness, credit derivatives carry significant risks that the 2008 financial crisis made painfully clear. Understanding these limitations is essential for prudent use of these instruments.

Unlike exchange-traded derivatives, CDS are over-the-counter contracts where the protection seller might fail to pay when the reference entity defaults. This counterparty risk was dramatically illustrated by AIG, which had sold massive amounts of CDS protection on mortgage-backed securities. When the housing market collapsed, AIG faced margin calls it could not meet, requiring a government bailout to prevent cascading failures. Post-crisis reforms have pushed more CDS trading to central clearinghouses, which interpose themselves between buyers and sellers and require margin collateral.

Wrong-way risk occurs when the likelihood of counterparty default is correlated with the credit quality of the reference entity. For example, if a bank buys CDS protection on another bank from a third bank, all three may face stress simultaneously during a financial crisis, precisely when the protection is needed most. This correlation of counterparty and reference entity default risk undermines the hedging value of CDS in systemic crises.

CDS markets can become illiquid during periods of stress. The basis between CDS spreads and bond spreads can widen dramatically when funding becomes scarce, as happened in 2008 when the basis reached hundreds of basis points. Traders who assumed convergence was inevitable faced margin calls before the basis normalized, forcing them to close positions at large losses.

CDS pricing relies on assumptions about hazard rates, recovery rates, and their correlation. The standard model assumes independence between default timing and recovery rates, but in practice these may be correlated. Default clusters (where multiple entities default simultaneously) can occur more frequently than models predict, as the financial crisis demonstrated with mortgage-related securities.

The definition of credit events can be ambiguous, leading to disputes about whether protection should pay out. The International Swaps and Derivatives Association (ISDA) maintains standardized documentation, but novel situations (like the Greek restructuring in 2012) can still create uncertainty. Additionally, CDS may not perfectly hedge the specific bond held by the protection buyer, creating basis risk between the protection payoff and actual losses.