Book Short: A Brand Extension That Works Usually, brand or line extensions don’t work out well in the end. They dilute and confuse the brand. Companies with them tend to see their total market share shrink, while focused competitors flourish. As the authors of the seminal work from years ago, Positioning: The Battle for Your Mind, Jack Trout and Al Reis would be the first people to tell you this. That said, The New Positioning, which I guess you could call a line extension by Jack Trout (without Reis), was a fantastic read. Not quite as good as the original, but well worth it. It’s actually not a new new book – I think it’s 12 years old as opposed…