Barbell Strategy (Via Negativa)
Subtractive knowledge is a form of barbell that is convex: what is known to be wrong is robust, while what is unknown is fragile, so one avoids it to prevent harm.
THE IDEA
BARBELLS, AGAIN
Subtractive knowledge is a form of barbell. Critically, it is convex. Knowledge of what is wrong is robust, while uncertain claims are fragile and speculative. Avoid relying on those claims in ways that could harm you if they turn out to be false.
The less-is-more idea is another application of via negativa.
When to use it
Constructing a resilient investment portfolio by avoiding moderate-risk assets.
Making personal decisions by eliminating harmful or uncertain choices first.
Managing risk in engineering by removing failure-prone components rather than adding redundancies.
Improving productivity by removing unnecessary tasks and distractions.
FROM THEORY TO EVERYDAY LIFE
In practice
Investment Portfolio Barbell
An investor uses a barbell strategy by allocating assets to very safe instruments (e.g., government bonds) and highly speculative but potentially lucrative ones (e.g., venture capital), while avoiding middle-risk assets. The subtractive knowledge lies in knowing that avoiding the risky middle reduces fragility and improves robustness.
Product Design via Negativa
A product team applies subtractive knowledge by systematically removing features that do not add clear value or introduce complexity. By focusing on what to omit rather than what to add, they create a more robust and user-friendly product.
A MOMENT TO REFLECT
Put it to work.
What areas of your life or work would benefit from identifying what is robustly wrong versus speculatively unknown?
How can you apply a barbell approach to reduce fragility in your decision-making?
In what situations might subtracting options lead to better outcomes than adding them?
Often confused with
CONTINUE THE CONVERSATION
Source texts
- Antifragile (Nassim Nicholas Taleb)