The Black Swan

The Black Swan: The Impact of the Highly Improbable

A Bird That Wasn't Supposed to Exist

Before Europeans landed in Australia, every educated person in the Old World was certain about one thing concerning swans: they were white. Centuries of observation, thousands of confirmed sightings, paintings, poems, even philosophical metaphors all rested on this quiet fact. Then, in the seventeenth century, Dutch sailors stepped off a boat in Western Australia and found themselves staring at a swan that was black. One bird, one observation, and a belief held by tens of millions of people across hundreds of years dissolved.

Nassim Nicholas Taleb takes that bird and turns it into a key for unlocking why human beings are so spectacularly bad at understanding the world they live in. His thesis is simple to say and uncomfortable to sit with. The events that matter most in history, in markets, and in your own life are the ones nobody saw coming. We do not write history. History happens to us, in sudden lurches, and afterward we pretend we knew it was coming all along.

That is what a Black Swan is. Taleb gives the term a precise three-part definition. First, it is an outlier, something that lies outside the realm of regular expectations because nothing in the past convincingly points to its possibility. Second, it carries extreme impact. Third, despite being unforeseeable, it is rationalized after the fact, fitted with explanations that make it look as if it could have been predicted. The September eleventh attacks, the rise of the internet, the fall of the Soviet Union, the 1987 crash, the success of Google, the First World War. A small number of these events explain almost everything in our world. Yet our institutions, our forecasts, our resumes and risk models all assume the world will keep behaving the way it just did.