Marketing's undisputed doyen offers an unbeatable guide on what not to do As the cost of marketing rises, its effectiveness is in decline. CEOs want a return on their marketing investment, but can't be sure their marketing efforts are even working. Truly, marketers have to shape up or watch their business go south. In this clear and comprehensive guide, renowned marketing expert Philip Kotler identifies the ten most common-and most damaging-mistakes marketers make, and how to