Gerd Gigerenzer Books

Gut feelings are not random sparks of emotion; they are condensed expressions of experience and evolution. Over the course of human history, our brains have developed shortcuts for making fast and frugal decisions in uncertain environments. I call these shortcuts heuristics—simple rules that ignore ...

From Gut Feelings: The Intelligence of the Unconscious

Traditional economics and psychology long assumed that rationality meant maximizing outcomes through complete information and unlimited cognitive capacity. But real humans operate under boundaries—limited time, knowledge, and computational power. My concept of bounded rationality acknowledges these ...

From Gut Feelings: The Intelligence of the Unconscious

When people hear about probability, their minds usually turn to randomness and complexity—concepts reserved, perhaps, for mathematicians. But in reality, the misunderstanding of risk has concrete, often painful consequences. Much of my research has shown that even experts, such as doctors or financi...

From Risk Savvy: How to Make Good Decisions

When faced with uncertainty, we often assume that complex algorithms must yield better decisions. Yet I have spent decades showing the opposite: simple heuristics—rules of thumb—can outperform elaborate statistical methods in real-world settings. Humans evolved to make quick judgments in uncertain e...

From Risk Savvy: How to Make Good Decisions