I'm sorry for the confusion, but it appears that there is no widely recognized essay called "A Marketing Revolution" by Robert Samuelson. Robert Samuelson is a well-known journalist who contributes economic analysis and opinion pieces for The Washington Post, but there doesn't seem to be any readily available record of an essay titled "A Marketing Revolution" by him. It's possible that you may have confused the author or the title. If you have more accurate details or if it's a lesser-known piece that isn't easily searchable, I would recommend reaching out to your teacher, professor or whoever assigned the reading or shared the essay with you for additional clarification. However, if you have any general questions about marketing, marketing revolutions, or the commentary and analysis typically provided by Robert Samuelson, I would be more than happy to help with that!