David Hume posed the issue in the following way (as rephrased in the black swan problem by... John Stuart… — Nassim Nicholas Taleb
David Hume posed the issue in the following way (as rephrased in the black swan problem by... John Stuart Mill) No amount of observations of white swans can allow the inference that all swans are white, but the observation of a single black swan is sufficient to refute that conclusion.
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More from this book
The information that a person derived some profit in the past... by itself, is neither meaningful nor relevant. We need to know the size of the population from which he came. If the initial population is 10,000 managers, I would ignore the results.
[B]ecoming more rational, or not feeling the emotions of social slights, is not part of the human race... not with our current biology. There is no solace to be found from reasoning...
A mistake is not something to be determined after the fact, but in the light of the information until that point.

