Cobra Effect · Thinking and evidence
The narrative fallacy
We invent causes for events because stories feel like explanations.
6 cards, read aloud in 2:24, with a test and sources.
December 2003. Saddam Hussein is captured, and the bond market has to explain itself.
A news wire reports that government bonds rose, because the capture might not stop terrorism. Half an hour later bonds fell. The same wire reported that they fell, because the capture made risky assets more attractive. Same cause. Opposite results. Both explained with total confidence.
Nassim Taleb collected that pair for a book called The Black Swan.
It came out in 2007. His point was not that the journalists were stupid. It was that a sequence of events without a story feels unbearable. So we supply one, and then we believe it.
That is the narrative fallacy.
We see a run of facts and weave them into a tale with a cause at the front and a lesson at the back. The tale is easier to remember than the facts. So the tale is what we keep. And then we mistake the tale for what actually happened.
Every success story is a suspect.
The founder who explains that it worked because of the culture. The investor who explains that the fund won because of discipline. Both are true stories about the winner. Neither was checked against the people with the same culture and the same discipline who lost. A story told after the ending is written can explain anything.
Hindsight makes it worse.
Once you know how it ended, the path there looks obvious. The clues that pointed the other way fade out of the memory. Ask anyone who predicted the crash of 2008 back in 2006. There are far more of them now than there were then.
The test is a question you ask before the story sets.
What else would have to be true if this explanation were right? Would the same story have explained the opposite result? If it would, it is not an explanation. It is a caption. So write down what you expect before you know the ending. It is the only version you cannot rewrite.
Sources
- The Black Swan, Nassim Nicholas Taleb, 2007. Chapter 6, The Narrative Fallacy, is the origin. The bond market story is in it, along with why we cannot leave a sequence unexplained.
- Thinking, Fast and Slow, Daniel Kahneman, 2011. Chapter 19, The Illusion of Understanding, takes Taleb’s idea and adds the evidence on hindsight and the stories we build around success.
- Hindsight bias, Wikipedia. The sibling: once you know the ending, the path looks inevitable. Baruch Fischhoff measured it in 1975.
Nearby ideas
- Confirmation bias. We look for evidence that agrees, and rarely test what could say no.
- Survivorship bias. The failures you never see can reverse the lesson you draw.
- The availability heuristic. Vivid stories make rare dangers feel common.
- Hindsight bias. Once you know the ending, it always looks obvious.
- Outcome bias. Judge a decision by what was known, not by how the dice fell.
- The framing effect. The same facts, worded differently, lead to different choices.
- Loss aversion. Losing something hurts about twice as much as gaining it pleases.
- The curse of knowledge. Once you know something, you cannot see what a beginner is missing.