Econs versus humans

Thaler's foundational joke-that's-not-really-a-joke is the distinction between Econs — the hyper-rational, emotionless optimizers that standard economic theory assumes populate the world — and actual Humans, who are impulsive, inconsistent, swayed by fairness, and bad at statistics. Traditional economics builds elegant models assuming Econs, then treats any human behavior that doesn't match as an error to be corrected or ignored.

His provocation is that this isn't a rounding error; it's the whole ballgame. If real decision-makers reliably deviate from Econ predictions in specific, repeatable directions — not randomly, but systematically — then a model built for Econs will systematically mispredict the real world, not just occasionally miss.

The book's larger mission is convincing economics to treat those systematic deviations as the actual subject matter, not noise to be averaged away. People aren't irrational at random — they're irrational in predictable, mappable ways, which is exactly what makes behavioral economics a science rather than just a list of exceptions.