It is a close look at the psyche of the masses that really invites us to think about what is happening in the groups of the loud, angry masses, and how the engine and the leader who seems less intelligent and less rational, how is he able to move these groups and direct them to what he wants from unconscious and irrational emotions and the book explains to us those tools with which we can influence Directly in the psyche of the masses and directing them to what we want from them.