Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent- Necessary Reading For Anyone Who "Buys" Anything

As Mark Helprin noted in "Monday" in _The Pacific and Other Stories_, we've become a nation of advantage-takers, where someone who doesn't squeeze every penny out of his mark is himself a sucker. In Levine's superb book, he helps the reader arm him- or herself with knowledge of some of the strategies and tactics purveyors of all sorts of things - from consumer goods to salvation - use against those of us who assume we're walking into such situations evenly matched. As someone who has spent his career in corporate procurement (and who wrote his thesis on advertising) I can attest that Levine is spot on with his cautionary analyses. Read this book carefully and pass it along to others, especially the young who may not have built up their defenses against some of the tactics described herein. If nothing else, at least you will recognize what game is being played with you when it happens.