Economic psychology refers to the psychological processes that affect economic decision making. The study of economic psychology has become increasingly interdisciplinary in recent years, with growing influence in economics, anthropology, and other social sciences. A rise in the use of behavioral experiments, in particular, has led researchers to revise the economic model of choice extensively by incorporating empirically grounded insights about the psychology of decision making. Specific research topics include choice under risk, intertemporal choice, how the brain encodes value, altruism and cooperation, the effects of norms and identity on decision making, and the evolution of social behavior in humans and other animals.