Mr. Paulos, who teaches mathematics at Temple, has a knack for making technical concepts clear and entertaining. It is a genius at translating the arcane .... This book should be required reading for anyone opening a brokerage account.

Paulos makes the process rewarding for those who want a better understanding of how the market works. Throughout this wide-ranging survey, the writing is spirited, funny and clear.

Yes, there are many percentage signs in this book ... But Paulos' humor and clarity will see you through, a double-chocolate nougat of a book — a rich, densely packed delight. It is also rueful, funny and disarmingly personal .

There is a certain pleasure to be had in reading that mathematical genius need be no barrier to financial comeuppance

We like to think not only that mathematicians are smarter than the rest of us but that by dint of their mastery of numbers, they hold the key to understanding the baffling mysteries of the universe. Alas, Paulos (Innumeracy) says that's not always the case. As the author relates in this funny, insightful little volume about attempts to bring order and science to the free-for-all that is the stock market, he himself was once a big investor (in WorldCom). Despite strong evidence to sell, he desperately hung on to his stock as the price plummeted, proving that a head for numbers doesn't always translate to Wall Street know-how. Through most of this book, Paulos discusses various methods for predicting markets and offers thoughts on why people keep trying to perfect them. Shocking in their obtuseness are the so-called Elliot Wave followers, who believe stocks operate according to an impossibly arcane series of numerical waves and cycles. The efficient-market theorists-many of whom believe the stock market is so inherently efficient that everything one needs to know about a company is reflected in its stock price-get the most thorough joshing from Paulos: never able to resist a joke, he tells one about how many efficient market theorists it takes to change a light bulb. "Answer: None. If the light bulb needed changing the market would have already done it." Playful and informative, Paulos's book will be appreciated by investors with a sense of humor.

A severe investment miscalculation leads to valuable lessons about the tricky psychology and thorny arithmetic of the market. Bestselling mathematician Paulos (Innumeracy, 1988, etc.; Mathematics/Temple Univ.) invested in WorldCom, he averaged down and bought more WorldCom, he bought WorldCom calls, and he bought WorldCom on margin. He lost a lot on WorldCom, but since that loss gave rise to this account, it's a gain for investing readers. His uncommonly cogent text does not promote a secret investment method for attaining riches. Rather, it lucidly clarifies many of the mathematical and statistical influences on the stock market. With accustomed humor and apt examples, Paulos tackles complex computations that are vaguely understood and frequently misapplied by Wall Street pros. He explores the deficiencies of both technical and fundamental analyses. Diversification, covariance, beta factors, and various portfolio selection models utilized by brokerage theoreticians all have mathematical perils unseen by the most sophisticated players, the author argues. He introduces the wave theory of market movements, based on Fibonacci numbers, to the golden ratio. He warns that scams like pump and dump, short and distort, e-mail chat-room diversions, or plain old book-cooking will surely affect an investment; so may arcana like moving averages, regression to the mean, standard deviation, availability error, Benford's Law, and the Nash equilibrium, not to mention psychological, logical, and belief-system influences. In his generally accessible explanations, Paulos walks the reader through basic formulae and eschews tables and charts-even where they might help.

Investors would do well to heed his entertaining, frequently counterintuitive, always useful bean-counting methodology. A first-rate exploration into the math of the market: heuristic numeracy at its best.

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