To explain how manipulation works, this book explores the psychological levers that manipulators use to get us to make the mistakes that will get us to do what they want. These include various cognitive and decision-making biases, our tendency to choose the lesser good over the greater good when the lesser good is immediately available, and the simple fact that human reason is an imperfect thing. To explain why manipulation seems like a bad thing, Noggle first argues that, while manipulation is always presumptively immoral, it can be justified in extreme situations. He then shows that manipulation's presumptive immorality derives from the fact that it involves getting someone to make a mistake, and making a mistake is a bad thing. However, the most morally egregious instances of manipulation also have bad effects on well-being and autonomy. This book concludes by applying the Mistake Account to various influences, including priming, conditioning, nudges, advertising, sales, and online influences.