Black Swan

Actionable Insights

• stop constructing mental models of the future as if they're real.
• Barbell your life. Be ultra-conservative in most things, and take many small asymmetric bets where the downside is capped and the upside is open.
• for any belief you hold firmly, spend 15 minutes seriously trying to construct the scenario under which it fails catastrophically.
• When you feel the pull to close a question with an explanation, notice that feeling, sit with it, and ask what the simplest honest answer would be if you stripped away the narrative.
• Replace a book with few conversations with people outside your field

Ponder

• Why does reading the newspaper actually decrease your knowledge of the world?
• How can we improve our meta-cognition?

Highlights

Prologue

What we call here a Black Swan is an event with the following three attributes.

• It is an outlier.
• It carries an extreme Impact.
• In spite of its outlier status, human nature makes us concoct explanations for its occurrence after the fact, making it explainable and predictable.

This combination of low predictability and large impact makes the Black Swam a great puzzle.

Black Swan logic makes what you don't know far more relevant than what you do know.

Isn't it strange to see an event happening precisely because it was not supposed to happen?

Consider the Indian Ocean tsunami of December 2004. Had it been expected, it would not have caused the damage it did - the areas affected would have been less populated, an early warning system would have been put in place. What you know cannot really heart you.

The inability to predict outliers implies the inability to predict the course of history. Our cumulative prediction error for political and economic events are so monstrous that every time I look at the empirical record I have to pinch myself to verify that I am not dreaming. Wars are fundamentally unpredictable and we do not know it.

Can't agree more with what has just happened with the recent US-Israel Iran War (2026), US didn't expect Iran to fight back and strait of Hormuz was out of scope in their calculations.

There are so many things we can do if we focus on antiknowledge, or what we do not know. You can set yourself up to collect serendipitous Black Swans(of the positive kind) by maximizing your exposure to them. Some fields like scientific-discovery and venture capital have disproportionate payoff from the unknown.

We tend to learn the precise, not the general. We do not spontaneously learn that we don't learn. We are not so good at Meta-cognition. We scorn the abstract; we scorn it with passion.

Our intuitions are made for an environment with simpler causes and effects and slowly moving information.

The Television(Media) that, we will see, is the carrier of unfairness and a major cause of Black Swam blindness.

We humans are not just a superficial race(this maybe curable to some extent); we are a very unfair one.

If you want to get an idea of a friend's temperament, ethics, and personal elegance, you need to look at him under the test of severe circumstances, not under the regular rosy glow of daily life.

Indeed the normal is often irrelevant.

All the while almost everything studied about social life focuses on the "normal," particularly with "bell curve" methods of inference that tell you close to nothing.

Because the bell curve ignores large deviations, cannot handle them, yet makes us confident that we have tamed uncertainty. Its nickname in this books if GIF, Great Intellectual Fraud.

Platonicity is what makes us think that we understand more than we actually do. These models are like potentially helpful medicines that carry random but very severe side effects.

The gap between what you know and what you think you know becomes dangerously wide. It is here that the Black Swan is produced.

What is too dull for me to write about might be too dull for the reader to read.

You need a story to displace a story. Metaphors and stories are far more potent than ideas. Ideas come and go, stories stay.

We lack imagination and repress it in others.

The Black Swan idea is based on the structure of randomness in empirical reality.

I make the bolder claim that in spite of our progress and the growth in knowledge, or perhaps because of such progress and growth, the future will be increasingly less predictable, while both human nature and social science seem to hide the idea from us.

How we seek validation