The course will introduce students to the key concepts of behavioral economics like bounded rationality, heuristics for complex choices, prospect theory and the framing effect. Then, this concepts will be used to revise the neoclassical theory of choices under risk, and the prospect theory will be discussed. How the most recent evidence on human behavior have changed the ways in which social preferences are investigated is the third part of the course. The fourth part will be devoted to the role played by culture and evolution to explain economic choices. The course will finish with an introduction to the literature on happiness. All the topics will be presented both in theory and by using examples taken by traditional topics in economics as the saving decisions, the wage definition and its rigidity, the free riding and the public goods provision, the role played by incentives and punishment.