Silent Evidence
Silent evidence refers to the invisible successes or survivors that are not accounted for, leading to a biased perception of reality. In medicine, a drug that saves many lives may be avoided because the harms are visible anecdotes while the saved lives remain invisible statistics.
THE IDEA
Our neglect of silent evidence kills people daily. Assume that a drug saves many people from a potentially dangerous ailment, but runs the risk of killing a few, with a net benefit to society. Would a doctor prescribe it? He has no incentive to do so. The lawyers of the person hurt by the side effects will go after the doctor like attack dogs, while the lives saved by the drug might not be accounted for anywhere.
A life saved is a statistic; a person hurt is an anecdote. Statistics are invisible; anecdotes are salient. Likewise, the risk of a Black Swan is invisible.
When to use it
Evaluating medical treatments where side effects are reported but successful outcomes are not
Assessing business strategies when only failed ventures are publicized
Making investment decisions based on visible success stories while ignoring the many unseen failures
FROM THEORY TO EVERYDAY LIFE
In practice
Doctor Prescribing Drug
A doctor considers prescribing a drug that saves many patients from a serious illness but has a small risk of fatal side effects. The few deaths become visible anecdotes, while the many saved lives are invisible statistics, biasing the decision against the drug despite net benefit.
A MOMENT TO REFLECT
Put it to work.
Can you recall a situation where you only heard about failures but not the successes that outnumber them?
How might silent evidence affect your perception of a product's safety or effectiveness based on reviews?
In what areas of life might invisible successes be systematically overlooked, leading to poor decisions?
CONTINUE THE CONVERSATION
Source texts
- The Black Swan The Impact of the Highly Improbable With a new section On Robustness and Fragility (Nassim Nicholas Taleb)