Default Correlation

Default correlation is a statistical measure that describes the tendency of two or more assets within a portfolio to experience a credit event, such as a bankruptcy or payment default, at the same time. High default correlation implies that assets are highly sensitive to the same systemic economic shocks, meaning they are likely to fail together.

Low default correlation suggests that defaults are driven by company-specific or idiosyncratic factors rather than shared systemic risks. In structured finance, understanding this correlation is vital for pricing tranches because it dictates the probability distribution of total losses.

If assets are perfectly correlated, the portfolio acts as a single binary risk; if they are uncorrelated, the portfolio follows a binomial distribution. Accurate estimation of this metric is critical for capital allocation and regulatory compliance in derivative trading.