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Title: If you buy it, you have fallen victim of methods therein.
Review: The big title "Ph.D" beside his name follows the Authority method (chapter 6). The quoted comments are blantant use of the Social Proof method (chapter 4). If you buy other books of Dr. Cialdini, you fall victim to the Commitment and Consistency principle (chapter 3). But indeed, this book says very little that has not been said in Carnegie's "How to Win Friends and Influence People"
