Taleb has referred to the book as an essay or a narrative with one single idea: "our blindness with respect to randomness, particularly large deviations." The book moves from literary subjects in the beginning to scientific and mathematical subjects in the later portions. Part One and the beginning of Part Two delve into
psychology. Taleb addresses science and business in the latter half of Part Two and Part Three. Part Four contains advice on how to approach the world in the face of uncertainty and still enjoy life. Taleb acknowledges a contradiction in the book. He uses an exact metaphor, the
Black Swan idea to argue against the "unknown, the abstract, and imprecise uncertain—white ravens, pink elephants, or evaporating denizens of a remote planet orbiting Tau Ceti." ===Part one: Umberto Eco's
antilibrary, or how we seek validation=== In the first chapter, the Black Swan theory is first discussed in relation to Taleb's coming of age in the
Levant. The author then elucidates his approach to historical analysis. He describes history as opaque, essentially a
black box of cause and effect. One sees events go in and events go out, but one has no way of determining which produced what effect. Taleb argues this is due to
The Triplet of Opacity (an illusion of understanding in which we think we understand a complicated world). The second chapter discusses a neuroscientist named Yevgenia Nikolayevna Krasnova, who rejects the distinction between fiction and nonfiction, and her book
A Story of Recursion. She published her book on the web and was discovered by a small publishing company; they published her unedited work and the book became an international bestseller. The small publishing firm became a big corporation, and Krasnova became famous. But her next book fails. So, she experienced two black swans. The book goes on to reveal that the so-called author is a work of fiction, based in part on Taleb. The third chapter introduces the concepts of
Extremistan and
Mediocristan. He uses them as guides to define the predictability of the environment one is studying.
Mediocristan environments can safely use
Gaussian distribution. In
Extremistan environments, a Gaussian distribution should be used at one's own peril. In this part he quotes
Benoit Mandelbrot and his critique of the Gaussian distribution. Chapter four brings together the topics discussed earlier into a narrative about a
turkey before
Thanksgiving who is fed and treated well for many consecutive days, only to be slaughtered and served as a meal. Taleb uses it to illustrate the philosophical problem of
induction and how past performance is no indicator of future performance. He then takes the reader into the history of
skepticism. In chapter nine, Taleb outlines the multiple topics he previously has described and connects them as a single basic idea. In chapter thirteen, the book discusses what can be done regarding "epistemic arrogance", which occurs whenever people begin to think they know more than they actually do. He recommends avoiding unnecessary dependence on large-scale harmful predictions, while being less cautious with smaller matters, such as going to a picnic. He makes a distinction between the American cultural perception of failure versus European and Asian stigma and embarrassment regarding failure: the latter is more tolerable for people taking small risks. He also describes the "
barbell strategy" for investment that he used as a trader, which consists in avoiding medium risk investments and putting 85–90% of money in the safest instruments available and the remaining 10–15% on extremely
speculative bets. ==Argument==