Richard Thaler on Behavioral Economics: Past, Present, and Future. The 2018 Ryerson Lecture

Behavioral economics bridges the gap between traditional neoclassical theory and human reality by replacing the idealized "Econ"—a perfectly rational optimizer—with actual human behavior. While standard economic models assume agents possess unbiased beliefs, self-control, and consistent self-interest, empirical evidence reveals that people frequently deviate from these assumptions in predictable ways. Key insights include the "big peanuts" phenomenon, where high stakes do not necessarily eliminate irrationality, and the power of "supposedly irrelevant factors" like default settings in retirement savings or health insurance choices. By integrating psychological principles into economic analysis, researchers can better explain market anomalies, such as the Cuba Fund’s irrational price surge, and design effective policy interventions. Ultimately, the field seeks to move beyond rigid, non-behavioral assumptions to create models with greater explanatory power, helping individuals make better decisions regarding health, wealth, and long-term happiness.