Margin of Safety - now there's an ironic title for an out-of-print book that is so sought after that rare second-hand copies sell for £1,330 on Amazon. Ironic because there is clearly no margin of safety for anyone who pays that price. After all, it's not the secrets of the text that generates the value. That can't be, since a PDF of the book is available as a free download. And it's doubly ironic because Margin of Safety, the book, is an investment text with the core message that much of the time investors forget all about margin of safety, the concept, when they buy and sell stocks and bonds.