The 42 Rules of Marketing is a compilation of ideas, theories, and practical approaches to marketing challenges the author has been collecting over the past 17 years. The idea was to create a series of helpful reminders; things that marketers know we should do, but don’t always have the time or patience to do. The concept of the 42 rules is that almost anything in life can be summarized into 42 distinct ideas that capture the essence of the topic.