Your economics class told you people are rational. Then you watched someone pay $6 for a coffee they swore they'd never buy again. There's a gap between the textbook model and how decisions actually get made — and that gap has a name: behavioral economics.

**TLDR: Cognitive Biases and Economic Decisions** closes that gap fast. Short by design, you'll understand why the classical rational-actor model broke down, what psychologists Kahneman and Tversky discovered about mental shortcuts, and how concepts like loss aversion, present bias, and anchoring shape everything from grocery prices to retirement savings to stock market bubbles. The final section walks through nudge theory and choice architecture — the policy toolkit built directly from these findings.

This guide is written for high school students in economics or AP courses, college freshmen meeting behavioral economics for the first time, and anyone who picked up a book like *Thinking, Fast and Slow* and wanted a structured entry point before diving deeper. If you're looking for a behavioral economics study guide with no filler that gets to the concepts your exam will actually test, this is it.

Each section leads with the core takeaway, defines every term in plain language, and works through concrete examples — no prior economics background required. Comprehensive but tight, with zero padding.

Buy it, read it in one sitting, walk into class ready.

• Explain the rational-choice (homo economicus) model and why behavioral economics challenges it
• Identify the major cognitive biases — anchoring, availability, loss aversion, framing, overconfidence, and present bias — with concrete examples
• Use prospect theory to predict choices under risk and contrast it with expected-utility theory
• Recognize how biases show up in markets: pricing, saving, investing, and consumer behavior
• Evaluate 'nudges' and choice architecture as policy tools, including their ethical limits

1. 1. The Rational Actor and Why Economists Stopped Believing in Him
   Introduces the classical rational-choice model, then explains how systematic deviations from it gave rise to behavioral economics.
2. 2. Heuristics: The Mental Shortcuts Behind the Biases
   Explains System 1 vs System 2 thinking and the core heuristics — availability, representativeness, and anchoring — that produce predictable errors.
3. 3. Loss Aversion, Framing, and Prospect Theory
   Walks through prospect theory and shows how loss aversion, reference points, and framing effects reshape choices under risk.
4. 4. Time, Confidence, and the Self-Control Problem
   Covers present bias, hyperbolic discounting, overconfidence, and confirmation bias — the biases that wreck saving, investing, and planning.
5. 5. Biases in Markets: Pricing, Saving, and Investing
   Shows how the biases play out in real markets — sticky prices, retirement under-saving, market bubbles, and consumer behavior.
6. 6. Nudges and Choice Architecture: Designing Better Decisions
   Introduces Thaler and Sunstein's nudge framework, gives examples of successful and failed nudges, and weighs the ethical debate over libertarian paternalism.