Antifragile: Things That Gain from Disorder (Incerto) Paperback – January 28, 2014

1 Summary
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1.1 Introduction
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Taleb conveniently quotes one of his friend's summary of this book: "Everything gains or loses from volatility. Fragility is what loses from volatility and uncertainty."

I think the point is better expressed by rephrasing: "Antifragility is what gains from volatility and uncertainty, up to a point. And being antifragile is a good thing."

Well, that's pretty much summarizes this 500-pages-long book. The rest is an accumulation of more or less relevant topics, delivered in Taleb's trademarked seering, holier-than-thou, hero-or-moron style. Why, even in "Dynamic hedging", his first, $100-book on trading exotic options, he was already both immensely entertaining and almost unbearably infuriating.

1.2 A few of the more interesting points:
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1.2.1 Every phenomenon in the world belongs to one of the following categories:
Fragile: vulnerable to unforeseen shocks
Robust: indifferent to shocks
Antifragile: thrive on shocks, up to a point.
That's what Taleb calls the Triad.

1.2.2 Most modern structures are inherently fragile
Salaried employment: while it looks safe on the surface (predictable salary every month) it is subject to the catastrophic risk of losing one's job.
Debt-fueled economies: debt has no flexibility, so these economies can't stand even a slowdown without risking implosion (cf current situation)
Modern societies: efficiency demands are pushing the structures to the maximum, so a little sand in the cogs make the whole edifice totter.
Touristification: turning adventures (kids growing up, people visiting foreign countries) from exciting, dangerous activities into bland, Disneyfied and safe ones.

1.2.3 Ways to be antifragile include:
Stressors: it is healthy to be subject to some punctual stresses to awake the organism from complacency (e.g. irregular meal times, violent exercise or ingesting small amounts of poison)
Barbell strategy: put 90% of your eggs into something super-safe and be very risk-seeking with the other 10% (swing for the fences).
Optionality: get into situations where downside is limited but upside is unlimited (non-linearity)
Redundancy: have more than one way to have things done.
Less is more: don't add unnecessary things.
Tinkering: empiricism is better than top-down academic research
Small is beautiful: large organizations are inherently fragile, but small structures are well adapted to be nimble and profit from unexpected opportunities.

1.2.4 For small troubles, better trust nature and do nothing than bring untested methods that can have tragic unforeseen consequence
Beware of neomania: don't embrace novelty for the sake of it
Stick to time-tested methods: what has stood the test of time has proved to be robust
Don't sweat the small stuff if it can lead to tragedy: radiation used to cure acne leading to leukemia, thalidomide prescribed to reduce morning sickness leading to malformed babies.

1.2.5 An antidote to the lack of accountability seen in the powerfuls who rule us (government officials, corporate honchos, bankers)
Have them have skin in the game, i.e. to share in the downside of their decisions. Taleb quotes the 3000-year-old+ Hammurabi code, "eye for an eye, teeth for a teeth."

2 Review
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So, what's the score? As with his other books, I found myself reading every page the first 40-50 pages, then turning the pages faster and faster as the neat, amusing prose turns into Fidel Castro-style interminable ramblings, hyperboles and inaccuracies, annoying personal anecdotes, and worst of all, the silly little tales with his imaginary heroes Nero Tulip and Fat Tony (Tulip seems to be some kind of idealized version of Taleb himself). One or two hours for the first third, 40 minutes for the second and 15 minutes for the last.
And I'll spare (or maybe not) the "very technical" appendix 2 with its silly little formula he seems to be so proud of. Thanks for teaching us high-school math about convexity (Jensen inequality as if it were rocket science? Come on!)

The basic point is sound however: we sure all need a bit more antifragility in our lives.
If we only ditched what is unnecessary (going to the doctor for trivial stuff, seeking novelty for the sake of it, buying stuff we don't need), we'd have gone a long way toward being more robust.
But going beyond that is more problematic: Taleb waxed lyrical about the upside of antifragility, but he says nothing about its cost.
And seeing how he came to his idea from the world of options trading, it looks dishonest. In options trading, when you buy and option and get all the good stuff associated with it (unlimited upside, limited downside), the flipside is that it costs money everyday (time decay). Spending all your time buying options is quite a good way to the poorhouse.
As in the financial world, so in the real world, unless you're talking about "free optionality" (the people who don't have skin in the game that Taleb reviles). Maybe being a free agent beats being an office drone because one doesn't need to fear getting fired, but what about the daily stress of needing to go out and find work without any certainty to get it? That's a cost that's a bit too high for probably most people.

In conclusion, this is an imperfect, overlong and often eye-roll-inducing book (as is usual for Taleb), but it presents an intriguing and original argument for the reader to chew on.

I begin for readers who have not read anything else by this author, especially those who are familiar with his ideas only second-hand. His second book, Fooled by Randomness, is by far the easiest introduction to his ideas. It is relatively short and illustrates his ideas in dramatic and amusing stories. For people with technical backgrounds, the first book, Dynamic Hedging, makes the points in a much more restricted domain (managing risk of financial options) which allows more precision. The Bed of Procrustes is striking and insightful, but as it is a series of loosely connected aphorisms, the reader has to sort out the links for herself.

Taleb's third and most commercially successful book, The Black Swan, and this one (which may become his most successful), lay out his ideas in more breadth and depth. The three in the first paragraph are relatively non-controversial. They are critical mainly of people who are safe to ridicule, those who are blind to the uncertainty in the universe in fields that are ruled by randomness, such as finance. The Black Swan and Antifragile attack--in the most intemperate language--people, ideas and professions accustomed to reflexive worship. The attacks are vigorous and directed at the core beliefs that underpin large areas of modern life.

These latter two books are more difficult to read. They are long, and their complex ideas are interwoven in overlapping essays rather than dissected in textbook order. Every page contains outrageous contentions that few readers will accept in full. You can skate on the surface taking the books as pure iconoclasm, amusing and provocative but ultimately specious. They're actually valuable taken in that spirit, but they are far deeper and more important than that.

The Black Swan concentrates on the case that long-term outcomes are dominated by events that are individually highly improbable, and also that are inherently unpredictable--Black Swans. Many people have interpreted "inherently unpredictable" as "hard to predict," and set to work on techniques to predict Black Swans. That misses the point. The events only have their impact BECAUSE they were not predicted. If someone invented a Black Swan prediction system, all it would do is make different highly improbable events into the Black Swans.

A common criticism of The Black Swan is that it tears opposing ideas down without giving any positive advice about what to do. That is, if long-term outcomes are dominated by Black Swans, why do anything at all except wait around and hope the unpredictable, improbable events are good for you rather than bad? In fact, there is quite a bit of sound advice in The Black Swan (see the short review by David Aldous at [...] for the best and most balanced summary of the claims) but the advice is about avoiding predictable disaster caused by unpredictable events, and keeping yourself open to positive outcomes from improbable events.

Antifragile complements The Black Swan by celebrating systems that gain from disorder, trading away short-term predictability and micro-rationality for long-term success exploiting macro-unpredictability. It's a bold attitude, amply supported by argument and example from many fields. If anything, it is more outrageous and iconoclastic than The Black Swan. It is Taleb's most important book to date, as it closes the circle. On one level, the universe (at least as perceived by humans) is ruled by disorder, but on another level, the crucial elements are those that gain from disorder as eventually these are fitter for survival than any element, however strong, that requires order.

If you have read any of Taleb's other books, I suggest Antifragile is the best next one to read. If you have not read any, I suggest starting with either Fooled by Randomness or if you have a technical background, Dynamic Hedging; then moving on to Antifragile. However, it is certainly possible to read Antifragile with no prior preparation. Eventually, everyone should read all of his books (or all of his thinking, most of which is available free at his website). But if you have to pick only one, Antifragile is the best choice.