Why old books are more likely to outlive new ones
In short: For humans, age is a countdown. For ideas, technologies, and books, age can be a shield. The Lindy effect suggests that for non-perishable things, the longer something has already survived, the longer it is likely to endure into the future. It is a theory of robustness where time is the ultimate judge.
The Lindy effect posits that the future life expectancy of non-perishable items—such as ideas, technologies, or books—is proportional to their current age. Unlike biological organisms, which have an unavoidable expiration date, non-perishable entities do not 'age' in the traditional sense. Instead, they exhibit a resistance to change and competition. Mathematically, this corresponds to a Pareto probability distribution, where the mortality rate actually decreases as time passes. The concept originated from a folkloric belief among New York City media observers in the 1960s regarding comedians at Lindy's delicatessen. They theorized that a comedian's survival was inversely proportional to their exposure: a show running for two weeks might last another two, while a show lasting two years could expect another two. Benoit Mandelbrot later formalized this in 1982, suggesting that for things bounded by the life of the producer, future life expectancy is proportional to the past.
He noted that a person's collected works will, on average, continue for an equal additional amount of time. Nassim Nicholas Taleb expanded this in 2012, removing the bounds of the producer to include anything without a natural upper limit. He linked the effect to 'antifragility,' arguing that survival is the ability to handle disorder. In this framework, every year an item survives without extinction doubles its additional life expectancy. This creates a 'reverse aging' process: the more robust an item is, the more its longevity is proportional to its history. While some modern interpretations focus on lifestyle choices like diet and exercise, the core statistical principle remains that time is the only effective judge of durability.
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Sources
- Summary by Intellect · source: Lindy effect
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