Why are there so many people who smoke a lot or are addicted to different types of drugs? Why do so many people eat junk food in excess? And more generally ... why do so many people voluntarily decide to do things that they know hurt them in the long term? Richard Thaler, the last Nobel Prize in Economics, and solid member of the "Economics of Behavior" School, argues that the problem originates in the limited rationality of human beings. In their mental processes, argues the academic, people separate the immediate effects of an action from the aggregate and long-term effects of it, valuing them in different ways (usually more value to the present than to the future), and behaving systematically in a contrary to their own benefit. In this way, Thaler justifies the state intervention, "libertarian paternalism" he calls, to remedy the incorrectness of people with an exacerbated "limited rationality", giving them a nudge in the right direction. It ...