The scholar, trader, and author Nassim Nicholas Taleb brings a decidedly contrarian view to the world of finance, statistics, and risk. In 2007, he published The Black Swan: The Impact of the Highly Improbable, which argues that we should never ignore the possibility or importance of rare, unpredictable events. In this interview with the Quarterly, he looks at the current financial crisis through the lens of his Black Swan thinking.

The Quarterly: For people who haven’t read The Black Swan, can you quickly summarize what they should know to understand your point of view on recent events in global financial markets?

Nassim Nicholas Taleb: Before Europeans discovered Australia, we had no reason to believe that swans could be any other color but white. But they discovered Australia, saw black swans, and revised their beliefs. My idea in The Black Swan is to make people think of the unknown and of the potency of the unknown, particularly a certain class of events that you can’t imagine but can cost you a lot: rare but high-impact events.

So my black swan doesn’t have feathers. My black swan is an event with three properties. Number one, its probability is...