The Lindy Effect: Why Old Ideas Tend to Outlast New Ones

What is the Lindy effect?

The Lindy effect says that for non-perishable things, the longer something has already lasted, the longer it is likely to keep lasting. A technology that has been in use for 50 years is, on average, a safer bet for the next 50 than one launched last year.

That reverses our intuition about aging. A 90-year-old person has fewer years left than a 20-year-old. But a 90-year-old book, recipe or legal principle has, if anything, more years left than a new one, because it has already survived decades of competition, fashion and criticism.

The model only works on things that don’t wear out with age:

• Works: books, ideas, technologies, institutions, languages, customs, rules of thumb.
• Doesn’t work: people, animals, machines, food, anything with a biological or mechanical lifespan.

The rough version people use: expect a non-perishable thing to last about as long again as it has already lasted. Treat that as a heuristic, not a formula.

Where it comes from

The name comes from Lindy’s, a New York delicatessen where comedians gathered. In 1964, writer Albert Goldman published an article in The New Republic about “Lindy’s Law”, proposing that comedians’ careers are limited by how much material they burn through on television. That early version was about running out, not lasting.

The mathematician Benoit Mandelbrot reformulated the idea in terms of probability distributions: for some things, the expected remaining life grows with the life already lived. Nassim Nicholas Taleb took it further, discussing it in The Black Swan (2007) and developing it in Antifragile (2012), where he made the perishable versus non-perishable distinction central. In Taleb’s use, time is the best filter for quality: what survives has been tested by more conditions than any expert could design.

How to use the Lindy effect

1. Ask how long it has survived. When choosing a book, a skill, a tool or a principle, find out its age. Age is cheap information most people ignore.
2. Check that it is non-perishable. Make sure you are judging an idea or technology, not a person, company or physical object with a lifespan.
3. Check what it survived. Long survival through wars, recessions and fashion cycles counts for more than long survival in a protected niche. Use base rates: how often do things like this disappear?
4. Use age as a tiebreaker, then as a default. When two options look equal, choose the older. When you know little about a field, start with its oldest surviving texts and methods.
5. Mix in a small share of the new. Lindy is a bias toward survivors, so it misses future winners. Keep most of your bets old and a small slice experimental.
6. Revisit when conditions change sharply. Lindy assumes the future roughly resembles the past. A real break (a new technology, a law, a disaster) can end long-lived things quickly.

A practical way to apply this is a two-column list. In one column, write the tools, sources and habits you rely on most. In the other, write roughly how long each has existed in its current form. Anything under five years old that sits at the core of your work deserves a backup plan: an older alternative you could fall back on, or files you can export in a durable format. You don’t need to drop new things. You need to know which parts of your life would break if they disappeared.

3 real-world examples

Business

Say a startup must choose a database. One option has been in production use for decades; the other launched last year with excellent benchmarks. The Lindy effect favors the older one for the core system: it has met more edge cases, has more people who know it and is less likely to be abandoned. The new one might be fine for a side project where failure is cheap. This is a judgment about odds, not a verdict on the new tool.

Personal life

Imagine you have one hour a day to read. You can spend it on this month’s bestsellers or on books that have stayed in print for 50 years or more. Most new books will be forgotten within a few years; the old ones have already been filtered by generations of readers. A sensible split might be mostly old, some new. The compounding payoff is bigger too: knowledge that lasts keeps paying.

Investing

Investment ideas follow fashion cycles. Strategies built on long-standing principles, like diversification, low costs and buying with a margin of safety, have survived many market regimes. Hot themes often haven’t been through a full cycle yet. Lindy doesn’t say new themes are wrong. It says that long-surviving principles have more evidence behind them than a recent narrative does.

Common mistakes

• Applying it to perishable things. An old car, an aging founder or a company with a decaying product does not get more durable with age.
• Mistaking old for good. Some old things survive through inertia, protection or habit. Ask what tested them.
• Ignoring the graveyard. We see the old books that survived, not the thousands that didn’t. That is fine for choosing, since survival is the signal, but it means age alone says nothing about why something survived. See survivorship.
• Rejecting everything new. A Lindy-only strategy never adopts anything early, which has its own cost.
• Treating the rule of thumb as a formula. “It will last as long again” is a rough guide, not a prediction for a specific case.
• Counting only the brand, not the idea. A product name may be new while the idea under it is ancient. Judge the underlying practice, not the label.

Lindy effect vs survivorship bias

The Mentarium take

The Lindy effect is the quiet answer to the bandwagon effect. When everyone is excited about the newest framework, diet or management fad, the Lindy question is simple: how long has it been around, and what has it survived? Usually the honest answer is “not long, and not much”.

We find it most useful for what to learn. Skills like clear writing, arithmetic, persuasion, negotiation and basic statistics have been valuable for centuries and are likely to stay valuable. Specific tools and platforms come and go. A Model Stack for long-term choices is Lindy effect + Antifragility + Compounding: pick things that have lasted, prefer ones that benefit from stress, and keep at them long enough for the curve to bend.

Lindy is also a good editor for this site. Most of the models in the library are decades or centuries old. That is a feature. The newer ones have to earn their place the same way: by still being useful after the excitement fades.