I normally shy away from books about companies, as they have a tendency to be poorly written and self-congratulatory in tone. However, Purple Reign is a fascinating book, very well written, and the pro-company angle is not so strong that it turns you off reading. For someone interested in learning about how a business can sustain and re-invent itself over more than 100 years, this book is a must. It is a tale of initial invention followed by product refinement, the power of marketing and brand building and, finally, of how to survive in an increasingly competitive world. The sections on how Cadbury's survived the two World Wars and various depressions are particularly good, as are stories of taking over other businesses who have fallen by the wayside. A really good read.