White Swan Event

A white swan event is a major shock, such as a financial crisis or market crash, that was predictable from available information and often openly warned about, yet was still ignored or underestimated until it happened. The term plays on the black swan event, popularised by Nassim Nicholas Taleb, which describes rare events that are almost impossible to foresee. A white swan, by contrast, follows visible build-ups such as rising debt, asset bubbles or weak regulation. The economist Nouriel Roubini argued that the 2008 financial crisis was a white swan rather than a black one. Between the two sits the gray swan event, known to be possible but thought unlikely. The idea matters for systemic risk because it suggests many crises come from ignored warnings rather than bad luck.