What Is the Lindy Effect? Taleb's Definition

The Lindy Effect is the principle that for non-perishable things (ideas, technologies, institutions), the longer something has survived, the longer it is likely to remain relevant.

If a book has been in print for 50 years, expect it to last another 50. If it has survived 2,000 years, expect several more centuries. Each day of survival is evidence against fragility.

The key: this applies only to non-perishable things. For humans and animals, the opposite is true — additional years shorten remaining life expectancy.

Why It Works

What survives has been tested by time's randomness. It has survived technological shifts, ideological changes, competing alternatives, and the simple wear of time. This survival is not random — it indicates the thing has genuine value.

What has survived must be serving some purpose, even if that purpose is not immediately legible to us.

By contrast, recent things have not been tested. They are still in their trial period. Most will fail. The ones that haven't failed yet are not proven.

Practical Applications

Books: Prefer a book published 100 years ago that is still in print to a bestseller from last year. The old book has survived more tests.

Technology: Email has existed 30 years. It should probably last another 30. Blockchain is 15 years old and might last 15 more. TikTok is 5 years old — don't plan for it being here in 20.

Practices: Ancient wisdom (don't overeat, exercise, get sleep, don't excessive debt) has survived millennia. Modern health advice from 2020 will mostly be revised by 2025.

Institutions: Institutions that have survived 500 years (universities, some churches, some companies) are more likely to survive another 500 than institutions founded yesterday.

The Neomania Trap

Modernity suffers from neomania — the love of the new for its own sake. The newest phone is almost immediately outdated. New management theories are exciting but evidence-free. New diets promise transformation but have zero long-term track record.

The Lindy Effect suggests the opposite strategy: prefer old and proven over new and trendy.

Go deeper:

For the full breakdown of the Lindy Effect and how to apply it, read The Lindy Effect: How the Old Outlasts the New.