Black Swan Theory

Black Swan is an event or occurrence that deviates beyond what exactly is normally expected of any situation and that would be extremely difficult to help predict. This phrase was popularized by Nassim Nicholas Taleb, some sort of finance professor along with former Wall Avenue trader. The black swan hypothesis or theory associated with black swan events is a metaphor that describes an event that comes as being a surprise, has a major effect, and is typically inappropriately rationalized following the fact with the main benefit of hindsight.