Strong-link problems and black swans from Extremistan
Written on 5 February 2025, 10:23pm
Tagged with: books, problem solving, reflections, technology
Mediocristan vs. Extremistan
- Mediocristan refers to domains where deviations are small and predictable (example: human height, weight).
- Extremistan refers to areas where a single event can have a massive impact (example: financial markets, wars, technological revolutions).
Most of modern life is influenced by Extremistan, meaning Black Swans are more common than we assume. Reminder, a Black Swan event:
- It is highly improbable.
- It has an extreme impact.
- It is unpredictable, but in hindsight, people try to rationalize it as if it was predictable.
Weak-link vs strong-link problems
Weak-link problems are problems where the overall quality depends on how good the worst stuff is. You fix weak-link problems by making the weakest links stronger, or by eliminating them entirely (example: food safety, nuclear proliferation, space missions safety, football).
In strong-link problems, the overall quality depends on how good the best stuff is, and the bad stuff barely matters (example: music, science, research, basketball).

Making the link
Weak-link problems are more likely to happen in Mediocristan:
- The system’s performance depends on improving the weakest part rather than relying on one exceptional element.
- Small, incremental improvements matter more than single outliers.
- Black Swans do not play a major role—consistency is more important.
Strong-link problems are more likely to happen in Extremistan:
- The system is shaped by a few extreme outliers rather than the overall average.
- A single individual or event can dominate and change everything (a few star investors, a group of scientists making a major breakthrough, etc).
- Black Swans are crucial—a breakthrough or disaster can redefine the entire landscape.

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