Early in his trading career, Nassim Nicholas Taleb arrived at a different entrance to his office building. His taxi driver had dropped him there. That day, his portfolio made exceptional profits. The next morning, Taleb heard himself asking for the same entrance. He also noticed he was wearing yesterday's coffee-stained tie.
He knew neither detail had moved the currency market. Yet a reward following an irrelevant action had made repeating it feel attractive. In Fooled by Randomness, this is part of the problem with feedback. Understanding the odds doesn't prevent automatic associations or emotional reactions. More information can strengthen both, giving us more occasions to worry and more false reasons to act.
The cost of looking
Taleb develops this through an invented retired dentist who subscribes to continuously updated portfolio prices. The dentist has unusually favorable investment prospects under a specified mathematical model. These are assumptions, not an actual investment record or a forecast for readers.
Under that model, the chance of a positive result over a year is roughly ninety-three percent. Over a month it is about sixty-seven percent. At very short intervals it approaches fifty-fifty. A favorable long-term tendency has little time to emerge from the fluctuations of the next second. Those small movements contain little useful evidence about the strategy, but each can still feel like a verdict.
Losses can hurt more than equal gains please. An almost even mixture of pleasant and painful updates therefore needn't leave the dentist feeling neutral. He can finish exhausted. His latest balance also becomes a fresh reference point. A decline from it feels like a loss, even within a profitable month. The screen keeps resetting the comparison.
Checking monthly gives him fewer occasions to react and, in this model, a greater proportion of positive observations. His underlying strategy hasn't improved. Nor do the probabilities promise any particular sequence of winning months. The observation interval changes the experience of the investment. Telling him to ignore the noise still leaves him exposed to every provocation.
Taleb describes a quick, associative mode of thought alongside slower, deliberate reasoning. Shortcuts save effort, but their impressions can violate probability. Practice makes some skills intuitive; it doesn't ensure that formal knowledge governs every emotional encounter. A rule describing how someone ought to choose cannot establish how they actually react.
Emotion is useful too. It helps end deliberation and gives people a reason to act. Taleb's account of brain research describes feelings influencing thought more strongly than thought restrains feeling. The goal cannot simply be to remove emotion and leave a calculator in charge.
News supplies especially persuasive material for these reactions. A frightening event feels more likely when its image comes readily to mind. Easily imagining how something could have happened differently can change our judgment too. Even the same odds described in terms of survival or death can evoke different choices. The description changes what we feel without changing the probability.
In one example Taleb discusses, people find a deadly flood caused by a California earthquake more likely than a deadly flood anywhere in North America. The detailed story is easier to picture. Yet the broader category already contains that earthquake-caused flood. Adding a vivid explanation has made the narrower possibility feel larger.
Financial commentary can encourage a similar confidence. Small price movements acquire causes, although the movement may be too weak to justify an explanation. A memorable story compresses separate events into a causal sequence and loses their uncertainty. Afterward, knowing the result makes yesterday's winning decisions look easier to identify than they were. We can credit our own gains to skill and explain losses as bad luck, preserving confidence across both outcomes. Acting on these stories can make bad information worse than having no update at all.
Before the next update
Taleb's response starts with the person who will keep reacting. He favors arrangements made before the temptation arrives. In the story of Odysseus, the sailors block their ears and bind their leader to the mast before the sirens sing. His later desire to be released cannot reverse the earlier arrangement. Taleb is particularly interested in the wax. Avoiding exposure can be easier than resisting it.
He avoids commentary he knows will provoke him and mutes financial television, reducing the persuasive effect of a confident voice. Silence hasn't proved the speaker wrong. It has changed the speaker's power over the listener. Smoothing a jagged record likewise helps distinguish substantial movement from small fluctuations that invite overinterpretation. He also favors ideas that have survived repeated encounters with events. Time may strip away urgency and clutter, though survival alone cannot prove an idea true.
For his own performance, Taleb describes withholding reports unless the result reaches a predetermined threshold. He decides in advance when a change is large enough to warrant his attention. This is a rule about seeing information. A stop loss is a rule about exiting a trading position. Restricting one does not perform the other's job.
The purpose is to make useful judgment easier while keeping insignificant events from repeatedly taking control. Genuine dangers still need attention. The dentist can understand his strategy without watching every tick, and Taleb can leave the stained tie behind without first becoming immune to superstition. The arrangement has to work for someone who still feels the pull.
Three things to keep
Frequent observations can multiply distress without revealing much about performance.
Knowing probability does not stop feelings from shaping beliefs and choices.
Set information rules before insignificant fluctuations acquire emotional force.