Taleb, Nassim Nicholas;
Fooled by randomness: the hidden role of chance in life and in the markets
Penguin Books, 2007, 316 pages [wiki]
ISBN 0141031484, 9780141031484
topics: | business | statistics | how-to | philosophy | history
This book is about luck disguised and perceived as nonluck (that is, skills), ... disguised and perceived as nonrandomness (that is, determinism). [prologue, opening lines xxxix] Politics: a country's president discounting on the jobs that "he" created, "his" recovery, "his predecessor's inflation". xl Economics: we link economic prosperity to some rate cut by the Federal Reserve Board, or the success of a company with the appointment of the new president "at the helm". Bookstores are full of biographies of successful men and women presenting their specific explanation on how they made it big in life (we have an expression, "the right time and the right place" to weaken whatever conclusion can be inferred from them). SYMBOLISM is the child of our inability and unwillingness to accept randomness; we give meaning to all manner of shapes; we detect human figures in inkblots. I saw mosques in the clouds announced Arthur Rimbaud the 19th-century French symbolic poet. This interpretation took him to "poetic" Abyssinia (in East Africa), where he was brutalized by a Christian Lebanese slave dealer, contracted syphilis, and lost a leg to gangrene. He gave up poetry in disgust at the age of 19, and died anonymously in a Marseilles hospital ward while still in his thirties. But it was too late. European intellectual life developed what seems to be an irreversible taste for symbolism—we are still paying its price, with psychoanalysis and other fads. Literature: the literature professor invests a deep meaning into a mere coincidental occurrence of word patterns, while the financial statistician proudly detects "regularities" and "anomalies" in data that are plain random. The French poet Paul Valery was surprised to listen to a commentary of his poems that found meanings that had until then escaped him (of course, it was pointed out to him that these were intended by his subconscious). We have been reading lengthy and complex messages in just about any manifestation of nature that presents jaggedness (such as the palm of a hand, the residues at the bottom of Turkish coffee cups, etc.). Optimists, [espousing an] Utopian Vision, associated with Rousseau, Godwin, Condorcet, Thomas Paine, and conventional normative economists, (rational choices are what is deemed good for you) Pessimists: (more realistic): Tragic Vision of humankind that believes in the existence of inherent limitations and flaws in the way we think and act," [associated with] Karl Popper (falsification and distrust of intellectiual "answers", actually of anyone who is confident he knows anything with certainty), Friedrich Hayek [AM: fatal conceit of big governments] and Milton Friedman (also suspicion of govts), Adam Smith (intention of man), Herbert Simon (bounded rationality), Amos Tversky and Daniel Kahneman (heuristics and biases), the speculator George Soros, etc. The most neglected one is the misunderstood philosopher Charles Saunders Peirce, who was born a hundred years too early [he coined the term scientific "fallibilism" as opp to papal infallibility.) Needless to say the ideas in this book fall squarely into the tragic category: We are faulty and there is no need to bother trying to correct our flaws. We are so defective and so mismatched to our environment that we can just work around these flaws. my brain (not Fooled by R) is in a fierce fight w my emotions (completely F by R). xlv As an empiricist (actually a skeptical empiricist) I despise the moralizers beyond anything on this planet. Croesus was so irked by the manifest lack of impression on the part of this illustrious visitor [Solon] that he attempted to extract from him some acknowledgment He asked him if he had known a happier man than him. Solon: cabt't tell - may change in course of time. 3 The modern equivalent has been no less eloquently voiced by the baseball coach Yogi Berra, who seems to have translated Solon’s outburst from the pure Attic Greek into no less pure Brooklyn English with “it ain’t over until it’s over,” or, in a less dignified manner, with “it ain’t over until the fat lady sings.” 4 Yet the story of Croesus has another twist. Having lost a battle to the redoubtable Persian king Cyrus, he was about to be burned alive when he called Solon’s name and shouted (something like) “Solon, you were right” (again this is legend). Cyrus asked about the nature of such unusual invocations, and he told him about Solon’s warning. This impressed Cyrus so much that he decided to spare Croesus’ life, as he reflected on the possibilities as far as his own fate was concerned. People were thoughtful at that time. Russian roulette is more than intellectual to me - I lost a comrade to this "game" during the Lebanese war, when we were in our teens. 24
I start with the platitude that one cannot judge a performance in any given field (war, politics, medicine, investment) by the results, but by the costs of the alternative (i.e., if history played out in a different way, [called] alternative histories). Those who fail agree, but those who succeed attribute their success to the quality of their decision. 22 [Wealth of a man should be measured not by his actual wealth, but by how he would have done if things had turned out in some alternative ways. The lottery winner who becomes richer than a dentist is really not rich.]
alternative histories appear in many disciplines. Philosophy: Leibniz's possible worlds: God's mind includes an infinity of possible worlds, of which he selected just one. These nonselected worlds are worlds of possibilities... Philosophers have a branch of logic - whether some property holds across all possible worlds --> related to notions in Phil of Lg, Paul Kripke's possible world semantics. Economics: Kenneth Arrow and Gerard Debreu : "states of nature" --> "state space" method - cornerstone of neoclassical econ theory and mathematical finance. simplified version called "scenario analysis" or "what-ifs" Reality is far more visious than Russian roulette. First, it delivers the fatal bullet rather infreq [say 1/1000s]. BLACK SWAN PROBLEM: After a few dozen tries, one forgets about the existence of a bullet, under a numbing false sense of security. 26 Any reading of the history of science would show that almost all the smart things that have been proven by science appeared like lunacies at the time they were first discovered. [AM: I would use different words for "proven" and "discovered" in this sentence, esp given Taleb's Popperian p.o.v.] Try to explain relativity to a journalist. 39-40 From the standpoint of an institurion, the existence of a risk manager has less to do with actual risk reduction than it has to do with the impression of risk reduction. EPIPHENOMENALISM: does the compass move the boat? By "watching" your risks, you may have an impression that you are reducing them. IMPLICIT AND EXPLICIT MEMORY: Swiss doctor [Edouard] Claparède had an amnesic patient completely crippled... he would have to reintroduce himself once every 15 min for her to remember who he was. One day he [hid] a pin in his hand before shaking hers. The next day she quickly withdrew here hand as he tried to greet her, but still she did not recognize him. [from Daniel L. Schacter Implicit Memory: History and Current Status [Critical Review] J Experimental Psychology: Learning, Memory, and Cognition 1987, Vol. 13, No. 3. 501-518 Claparede ( 1911 / 1951) reported observations that were similar to Korsakoff's, although they are somewhat better known today. Clapar~de described the now famous example of an amnesic woman who refused to shake hands with him after he pricked her with a pin, even though she did not explicitly remember that Clapar~de had done so. Clapar~de interpreted this implicit expression of memory in terms of a disconnection between the ego and the memory trace. At about the same time, Schneider ( 1912, cited in Parkin, 1982) reported experiments in which he demonstrated that amnesic patients required progressively less information across learning trials to identify fragmented pictures, even though patients did not explicitly remember having seen the pictures before.
Pierre Janet (1893) described a case in which a woman became amnesic after being mistakenly informed by a man who appeared suddenly in her doorway that her husband had died. Even though she subsequently could not consciously remember this incident, she "froze with terror" whenever she passed the door that the man had entered. Janet concluded that hysterical amnesia consists of two key factors: "1. the inability of the subject to evoke memories consciously and voluntarily, and 2. the automatic, compelling, and untimely activation of these same memories" ( 1904, p. 24). Freud's observations on hysteria were similar to Janet's insofar as he emphasized that traumatic memories, inaccessible to consciousness, were expressed unconsciously by the patient as hysterical symptoms (see Freud & Breuer, 1966, for relevant cases). Although Freud later changed this view (Ellenberger, 1970), he never abandoned the idea that unconscious memories exert powerful influences on behavior. The American psychiatrist Morton Prince clearly delineated the importance of implicit memory for normal cognitive function. ... concluded that " . . . a conscious experience that has passed out of mind may not only recur again as conscious memory, but may recur subconsciously below the threshold of awareness" (p. 8). These observations, Prince argued, demonstrate that experiences that are not available to conscious or voluntary recall nevertheless influence cognition and behavior in everyday life: In normal life ideas of buried experiences of which we have no recollection intrude themselves from time to time and shape our judgments and the current of our thoughts without our realizing what has determined our mental processes. We have forgotten the source of our judgments, but this forgetfulness does not affect the mechanism of the process. (p. 68)
Preface and Acknowledgments Chapter Summaries Prologue 1 Solon's Warning - Skewness, Asymmetry, Induction 7 1 If You're So Rich Why Aren't You So Smart? 11 2 A Bizarre Accounting Method 26 3 A Mathematical Meditation on History 40 4 Randomness, Nonsense, and the Scientific Intellectual 60 5 Survival of the Least Fit - Can Evolution Be Fooled by Randomness? 68 6 Skewness and Asymmetry 84 7 The Problem of Induction 99 Monkeys on Typewriters - Survivorship and Other Biases 111 8 Too Many Millionaires Next Door 117 9 It Is Easier To Buy and Sell Than Fry an Egg 125 10 Loser Takes All - On the Nonlinearities of Life 142 11 Randomness and Our Brain: We Are Probability Blind 149 Wax in my Ears - Living With Randomitis 169 12 Gamblers' Ticks and Pigeons in a Box 175 13 Carneades Comes to Rome: On Probability and Skepticism 182 14 Bacchus Abandons Antony 191 Epilogue: Solon Told You So 196 Notes 197 Index 198 About Texere 204 --- Fooled By Randomness is to conventional Wall Street wisdom approximately what Martin Luther's ninety-nine theses were to the Catholic Church. Malcolm Gladwell, in The New Yorker Finally in paperback, the word-of-mouth sensation that will change the way you think about the markets and the world.This book is about luck: more precisely how we perceive luck in our personal and professional experiences. Set against the backdrop of the most conspicuous forum in which luck is mistaken for skill -- the world of business -- Fooled by Randomness is an irreverent, iconoclastic, eye-opening, and endlessly entertaining exploration of one of the least understood forces in all of our lives.