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This audiobook is about luck, or more precisely, how we perceive and deal with luck in life and business. It is already a landmark work and its title has entered our vocabulary. In its second edition, Fooled by Randomness is now a cornerstone for anyone interested in random outcomes. Set against the backdrop of the most conspicuous forum in which luck is mistaken for skill, the world of trading, this audiobook is a captivating insight into one of the least understood factors of all our lives. In an entertaining narrative style, the author succeeds in tackling three major intellectual issues: the problem of induction, the survivorship biases, and our genetic unfitness to the modern word. Taleb uses stories and anecdotes to illustrate our overestimation of causality and the heuristics that make us view the world as far more explainable than it actually is. The audiobook is populated with an array of characters, some of whom have grasped, in their own way, the significance of chance: Yogi Berra, the baseball legend; Karl Popper, the philosopher of knowledge; Solon, the ancient world's wisest man; the modern financier George Soros; and the Greek voyager Ulysses. We also meet the fictional Nero, who seems to understand the role of randomness in his professional life, but who also falls victim to his own superstitious foolishness. But the most recognizable character remains unnamed, the lucky fool in the right place at the right time - the embodiment of the "Survival of the Least Fit". Such individuals attract devoted followers who believe in their guru's insights and methods. But no one can replicate what is obtained through chance. It may be impossible to guard against the vagaries of the Goddess Fortuna, but after listening to Fooled by Randomness we can be a little better prepared.… (more)
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Nassim Taleb's Fooled by Randomness has an unusual "curve": a short "head" of 5 star reviews and a long tail of lesser ratings which doesn't tail off. (it's even flatter on Amazon.co.uk!) A large standard deviation, then, against a mean of four stars, compared to Leonard Mlodinow's The Drunkard's Walk: How Randomness Rules Our Lives- also a four star average, but a much more conventional distribution of grades with a tighter standard deviation (a consistent curve from 50% five star to 2% one star, against Taleb's 46% five star and 11% one star).
So I have learned something from this (or Mlodinow's) book.
Having being equally entertained and aggravated by Taleb's more recent The Black Swan, I was leery of picking up this earlier effort. While Taleb is undoubtedly stimulating literary company, he does verges on being a crashing bore, crossing the verge on and ramming your letterbox on many occasions. He seems also to harbours some unremedied professional grievances - the award of Nobel prizes is something in particular which irks him. Taleb's writing is constantly grandiose and egotistical - but he is self-aware enough to not only realise but celebrate that fact.
So a real vegemite, love-him-or-hate-him sort of writer. Fooled By Randomness is, if anything, *more* bombastic, and its content less interesting. Its first half comprises mainly anecdotes (possibly apocryphal) about colleagues unnamed, and Taleb's repeated efforts to persuade you just how well read and what a voracious reader he is. (Interestingly in Black Swan he places much store in his *anti-library* - the books he has not read). Taleb's early observations about probability are pat, and under explained and, as other reviewers point out, have been more thoroughly and less idiosyncratically expounded by others (my recommendation is Leonard Mlodinow's book cited above).
On probability itself, Taleb's love of anecdote sometimes contradicts his own preaching. At one point he recounts a bit of "anecdotal empiricism" as to "Anchoring" of expectation. "I asked the local hotel concierge how long it takes to go to the airport. "40 minutes?" I asked. "About 35" he answered. Then I asked the lady at the reception if the journey was 20 minutes. "No, about 25" she said. I timed the trip: 31 minutes.
Two paragraphs later, in his next anecdote, Taleb rails against the stupidity of a man who derives conclusions from a single observation.
There is a seam of useful information in the second half of this book, but you must wade through quite a lot of self-aggrandisement to find it, and none is unique: as mentioned, there are better presented and less irritating accounts of the same information elsewhere, so Mr Taleb may be disappointed to see yet another equivocal assessment of his book on this site.
Except, he tells us, he won't be: he doesn't read or care about "amateur" reviewers on Amazon anyway, so no harm done.
Many human activities, particularly market-oriented businesses, are subject to much random fluctuation. Because of this, much success in such activities can be attributed only to luck. Taleb contrasts such businesses with dentistry, which has little or no random element to its successful practice.
People overemphasize frequency at the expense of total outcome. They prefer being right often, for small gain, than being occasionally very right about rare events ["black swans," in Taleb's shorthand] that allow very large gains. Maximizing the probability of winning [a little] does not maximizing the expectation from the game when one's strategy may include skewedness.
One of the greatest barriers to valid or even effective inference is survivorship bias. We tend to infer properties of an entire distribution of events [who made money; who didn't] from those left over after a shakeout process has eliminated some of the members of the distribution. The shape of our inferences can thereby be markedly different from that warranted by the original distribution.
Taleb's intellectual heroes include: 1. Solon--beware, King Croesus, your good fortune may not last; 2. Robert Shiller--financial markets overreact to late news; 3. Charles Pierce--infallibility is impossible; 4. George Soros--be aware of your own fallibility; 5. Karl Popper--real science consists in formulating principals that are inherently falsifiable: thus, it is invalid to infer the truth of any proposition from the fact it was correct any limited number of times; we can only infer its falsity [from one occurence]; history can not be not real science; 6. Daniel Kahneman and Amos Tversky--peoples' perceptions are distorted by immediate facts that inhibit them from making rational generalizations; and 7. David Hume--great rigor in drawing inferences from data.
His bete noires include (1) journalists in general and George Will in particular, who infer much too general ideas from much too small samples and (2) mathematical economists, who believe their models genuinely mirror reality.
A trader's mental construction should direct him to do what other people do not do. He is acutely aware of egodicity, i.e., that very long random sample paths wind up resembling each other. Thus even though some high risk strategies prove radically successful in the short run, they may eventually "blow up" in the long run. Taleb himself has made a good living as a commodities option trader by being aware of the randomness of market moves, and trading to protect his positions in regard to that randomness. He does not say explicitly what kinds of trades or techniques he uses; he only talks about his general philosophy.
A very interesting debunking of some commonly held business lore.
(JAB)
From the book, he does point out the existence of actual black swans, but I think this doesn't quite fit in his usage of the term to mean statistical outliers.
The black swan issue is by no means the only content of the book, there are some interesting ideas relating to risk management, that are applicable beyond trading. Still, there is something in his approach that doesn't quite sit right with me.
But what an obnoxious man. Who would want to meet him in
And for all his huffing and puffing, he barely addressed how to apply this knowledge to the market. OK, so he's betting against the odds, knowing such and such is actually much more like than most traders think and so on. But how does he know what the odds are? Vegas? Off-track-betting?
I don't I would have understood this at all if I hadn't just read Michael Lewis's The Big Short. Taleb must have made a killing there (though it seems to me he would have nosed his way into Lewis's book somehow if he did, despite his revulsion re journalists and journalism). But that was a pretty rare case in which, if you were willing to listen and read, the odds of the subprime mortgage bonds collapsing were readily apparent. But even the guys that Lewis profiled who did make the winning bets don't usually invest that way. They generally want to go long and look for solid companies that will grow. Taleb doesn't seem to ever look at companies that.
This important book highlights the centrality of probabilistic outcome in almost everything we do. It emphasises our exaggerated tendency to claim or allocate credit to people (e.g. CEOs of successful or unsuccessful companies) on the basis of ability rather than luck. This tendency is not only myopic, it is also dangerous. Taleb particularly highlights the false sense of security that exists in distorted situations where a highly likely beneficial scenario is paired with an unlikely, but extremely dangerous outcome. The classic example is in the market, where naked option sellers are able to pursue a 'reliable' strategy with steady small profits, but place themselves in a situation where extreme market movements can erase years of profits in days. These 'hidden risks' are explored in more depth in Taleb's later book The Black Swan which was especially prescient as it was published immediately before the 2007-08 financial crisis. The Black Swan revealed massive hidden risks concealed behind commonly accepted but flawed risk calculation models such as VAR.
Taleb writes in a conversational style that at times is a little indulgent. It is a very personal book with many asides regarding artistic preferences, and which invokes some of his pet subjects such as philosophy and poetry. I enjoyed this however others might feel this detracts from the central argument. It is a very personal argument as well, with examples that appear to be based on individuals known by Taleb and largely based on his expertise in the financial markets. It will provoke contemplation about both the source of our own success and also about the risks that we may not have considered. As an example it would have been (and may still be) valuable for instance to many who have highly leveraged themselves in purchasing property but who have not thought through the consequences of unemployment.
Action on these ideas will encourage a more robust investment strategy, and indeed life in general. Perhaps Taleb could have given a few more 'real world' examples from outside the world of finance to help people considering these ideas in a wider sense. Certainly he has written an eloquent and colourful account highlighting important concepts which may influence philosophical thought in years to come, and will hopefully have a practical impact on risk management and regulation in financial markets.
In particular he demonstrates how irrational human beings are when it comes to understanding:
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- that events with (seemingly) positive correlations do not necessarily mean that one causes the other, and,
- that randomness and uncertainty (i.e. luck) have a greater influence on the outcomes of human activities than most people, even those who think they act rationally, care to believe.
While written fairly clearly, I will admit that I had to read some sections more than once before I understood exactly what the author was saying, even though I have, or thought I had, a better than average understanding of probability and statistics.
Now at least I have a good understanding of why I act irrationally even when I know the true probability of success in some activities, such as when buying lottery tickets.