Random Guesses and Fake Gurus
Imagine receiving a series of market predictions from someone you’ve never heard of.
- The first prediction is correct;
- then the second;
- then the third.
After several accurate forecasts in a row, most people would naturally begin to believe that this person has a real talent for predicting the markets.
But what if every prediction had been nothing more than a random guess?
This simple thought experiment shows how probability alone can create the appearance of extraordinary skill.
The Prediction Experiment
Suppose someone contacts 100 people with a market prediction. Half are told that the market will rise. The other half are told it will fall.
- Once the market moves, roughly 50 people receive a correct prediction. The other 50 quickly lose interest and never hear from the sender again;
- the process is then repeated, but only with the people who received the correct prediction;
- again, half receive another correct forecast.
After several rounds, a small group remains. Every person in that group has seen nothing but successful predictions. From their perspective, the forecaster appears remarkably accurate. In reality, nothing has been predicted. The only thing at work is probability.
Why It Feels So Convincing
The experiment works because our brains naturally look for patterns. When we repeatedly observe successful predictions, we instinctively assume they are the result of knowledge or experience. At the same time, we rarely think about the much larger group of people who received incorrect predictions and quietly disappeared from the process.
Psychologists refer to this as survivorship bias: we focus on the apparent successes while overlooking all the failures that are no longer visible.
Other cognitive biases reinforce the illusion. Once we begin to believe someone is an expert, we tend to notice evidence that confirms our belief while paying less attention to anything that challenges it.
Together, these mental shortcuts can transform a completely random sequence into what appears to be undeniable proof of expertise.
The Lesson
The purpose of this experiment is not to suggest that genuine market expertise does not exist. Rather, it illustrates an important principle: a series of successful predictions is not, by itself, evidence of forecasting ability. Without knowing how many predictions were made, how many failed, or how the results were selected, even a seemingly flawless track record can be misleading.
Probability is capable of producing surprisingly convincing outcomes.
Understanding that fact makes it easier to evaluate extraordinary claims with a healthy dose of skepticism and to recognize that apparent skill is not always the same as genuine expertise.
