Correlation Breakdown Risk
Correlation breakdown risk is the danger that assets which are expected to move together suddenly stop doing so, or that assets expected to be uncorrelated suddenly move in the same direction. This is a common occurrence during financial crises, where panic-driven selling leads to a universal collapse in prices, regardless of the asset's underlying fundamentals.
For portfolio managers, this risk is particularly dangerous because it renders diversification ⎊ the classic defense against risk ⎊ ineffective. Understanding and quantifying this risk involves stress testing portfolios against extreme scenarios where historical correlations fail.
By preparing for these breakdowns, investors can better protect their capital and avoid being caught off guard when the market's internal structure changes abruptly during a period of stress.