The Fallacy of Market Predictions
A trader refuses to make market predictions, explaining the randomness and lack of verifiability, which frustrates a wealthy friend expecting expert opinions. Overconfidence in forecasting complex systems is a mistake.
THE IDEA
An Arrogant Twenty-nine-year-old Son
Outside of the need for entertainment in these shallow meetings I have resisted voicing a "market call" as a trader, which caused some personal strain with some of my friends and relatives. One day a friend of my father—of the rich and confident variety—called me during his New York visit (to set the elements of pecking order straight, he hinted right away during the call that he came by Concorde, with some derogatory comment on the comfort of such method of transportation). He wanted to pick my brain on the state of a collection of financial markets. I truly had no opinion, nor had made the effort to formulate any, nor was I remotely interested in markets. The gentleman kept plowing me with questions on the state of economies, on the European central banks; these were precise questions no doubt aiming to compare my opinion to that of some other "expert" handling his account at one of the large New York investment firms. I neither concealed that I had no clue, nor did I seem sorry about it. I was not interested in markets ("yes, I am a trader") and did not make predictions, period. I went on to explain to him some of my ideas on the structure of randomness and the verifiability of market calls but he wanted a more precise statement of what the European bond markets would do by the Christmas season.
He came away under the impression that I was pulling his leg; it almost damaged the relationship between my father and his rich and confident friend. For the gentleman called him with the following grievance: "When I ask a lawyer a legal question, he answers me with courtesy and precision. When I ask a doctor a medical question, he gives me his opinion. No specialist ever gives me disrespect. Your insolent and conceited twenty-nine-year-old son is playing prima donna and refuses to answer me about the direction of the market!"
When to use it
A financial advisor making bold market predictions to attract clients, ignoring the role of randomness.
A CEO relying on economic forecasts for strategic planning without considering their verifiability.
A gambler believing they can predict sports outcomes, leading to repeated losses due to overconfidence.
A journalist interviewing experts who confidently predict events, creating false certainty for the public.
FROM THEORY TO EVERYDAY LIFE
In practice
The Trader's Refusal to Predict
A wealthy friend of the narrator's father demands market predictions during a visit, expecting the same deference he receives from lawyers and doctors. The narrator, a trader, explains that he has no opinion and does not make predictions due to the randomness and lack of verifiability in markets. The friend becomes angry and complains to the father, highlighting the social pressure to offer expert forecasts even when they are meaningless.
A MOMENT TO REFLECT
Put it to work.
Why might it be dangerous to rely on expert predictions in complex systems like financial markets?
How can we distinguish between verifiable and unverifiable predictions?
What are the consequences of overconfidence in forecasting, especially when experts are pressured to provide opinions?
CONTINUE THE CONVERSATION
Source texts
- Fooled by Randomness The Hidden Role of Chance in the Markets and in Life (Nassim Nicholas Taleb)