"Buffettology" is the first book from someone who, thanks to personal and professional access to Warren Buffett, has been uniquely positioned to learn from the master. Mary Buffett had the privilege-- during her twelve years as his daughter-in-law-- of sharing some of this very private genius's informal discussions of his investing philosophy, and now she shares some of her invaluable observations with us. This breakthrough book offers a full-blown explanation of how Buffett uses "Business Perspective Investing" as a wealth-building tool. His strategy is not so much to "pick stock" but to search for and invest in excellent companies whose intrinsic value and potential earnings he can reasonably predict through a series of steps we learn about throughout the book. Citing many fascinating case histories and examples, "Buffettology" shows us what kinds of companies Buffett looks for and why, and which he avoids and why. The authors show us the mathematical models and equations Buffett uses to determine the basic value and earnings potential of his final choices (and the right price to pay, for which he is willing to wait). We also learn how with the aid of an inexpensive, widely available handheld calculator, anyone can do similar equations. In addition to providing such in-depth analysis, this book offers two more firsts. One is a chapter on Buffett's rarely discussed and extremely successful arbitrage operations. The book gives us the arbitrage equation he uses to determine the positions he should take. The other is a comprehensive list and brief analysis of fifty-four companies in which Buffett has invested and the authors believe he continues to follow, many of which have never before been publicly identified as "Buffett companies".