The Lindy Effect
The old outlives the new -- survival time predicts future survival
The Lindy Effect is Taleb's formalization of a heuristic: for non-perishable things (ideas, technologies, books, cultural practices), every additional day of survival increases expected future lifespan. A book that has been in print for 50 years can be expected to remain in print for at least another 50. A technology in use for a century will likely persist for another century. The old outlives the new in proportion to its age.
This is the opposite of how perishable things (humans, individual objects) age. A 40-year-old human has fewer expected years remaining than a 20-year-old. But a 2,000-year-old book has far more expected remaining life than a book published yesterday. The Lindy Effect applies to the non-perishable: ideas, recipes, procedures, institutions, political systems, technologies, and cultural norms.
The practical implication is a powerful heuristic for prediction and decision-making: prefer the time-tested over the novel. Read old books rather than new ones. Use proven technologies rather than bleeding-edge ones. Follow ancestral health practices rather than the latest dietary fad. The Lindy Effect provides a subtractive forecasting method: rather than predicting what new things will appear, predict that the fragile new things will disappear and the robust old things will persist.
- For non-perishable things, age is an indicator of future longevity
- The new is fragile; the old has been filtered by time
- Neomania (love of the new for its own sake) systematically overweights the untested
- Time is the ultimate stress test -- what survives has proven fitness
- Predict the future by subtracting the fragile, not by adding the novel
- Technologies, ideas, and practices that persist do so because they serve hidden functions we may not understand
- Classify as Perishable or Non-PerishableDetermine whether the thing you are evaluating is perishable (organic, individual, has a natural expiration) or non-perishable (informational, technological, ideational). The Lindy Effect applies only to the non-perishable. A single car is perishable; the automobile as a technology is non-perishable. A human is perishable; a religion is non-perishable.
- Assess Survival DurationFor non-perishable items, determine how long they have been in continuous use or relevance. The longer the track record, the more Lindy-robust the item. A restaurant open for 30 years is more likely to survive the next 5 than one open for 6 months. A programming language used for 40 years is more likely to be relevant in a decade than one released last year.
- Bias Your Choices Toward the Lindy-ValidatedWhen choosing between alternatives of uncertain future value, prefer the older, time-tested option unless there is overwhelming evidence the new one is genuinely superior. Read books that have been in print for decades. Use tools proven over generations. Follow health practices validated across centuries. The burden of proof is on the new.
- Resist Neomania in Decision-MakingActively counteract the bias toward novelty. Marketing, media, and social pressure all push toward the new. Develop the habit of asking: is this genuinely better than what has worked for centuries, or is it just newer? The chair, the book, the walk, fire for cooking -- these ancient technologies persist because they are deeply fitted to human needs in ways that no new technology has yet displaced.
Taleb describes meeting friends at a restaurant for dinner. He walks in shoes similar to those worn 5,300 years ago by the Alpine mummy. He uses silverware, a Mesopotamian technology. He drinks wine, in use for 6,000 years, poured into glasses of Phoenician origin (2,900 years). The food is prepared with fire, an ancient technology, and artisanal cheese using centuries-old methods. Every futurist prediction about space-age dining has failed; the ancient technologies persist.
The Lindy Effect was named after Lindy's delicatessen in New York, where comedians reportedly observed that the future life expectancy of a Broadway show or comedian's career was proportional to its current duration. The mathematician Benoit Mandelbrot formalized the concept. Taleb adopted and expanded it, connecting it to the broader framework of antifragility: things that have survived time are antifragile to time, while new things are untested and hence fragile. The Lindy Effect is time's mechanism for separating the antifragile from the fragile.